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Gary Brown

Does testing for statistical significance encourage or discourage thoughtful ... - 1 views

  • Does testing for statistical significance encourage or discourage thoughtful data analysis? Posted by Patricia Rogers on October 20th, 2010
  • Epidemiology, 9(3):333–337). which argues not only for thoughtful interpretation of findings, but for not reporting statistical significance at all.
  • We also would like to see the interpretation of a study based not on statistical significance, or lack of it, for one or more study variables, but rather on careful quantitative consideration of the data in light of competing explanations for the findings.
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  • we prefer a researcher to consider whether the magnitude of an estimated effect could be readily explained by uncontrolled confounding or selection biases, rather than simply to offer the uninspired interpretation that the estimated effect is significant, as if neither chance nor bias could then account for the findings.
  • Many data analysts appear to remain oblivious to the qualitative nature of significance testing.
  • statistical significance is itself only a dichotomous indicator.
  • it cannot convey much useful information
  • Even worse, those two values often signal just the wrong interpretation. These misleading signals occur when a trivial effect is found to be ’significant’, as often happens in large studies, or when a strong relation is found ’nonsignificant’, as often happens in small studies.
  • Another useful paper on this issue is Kristin Sainani, (2010) “Misleading Comparisons: The Fallacy of Comparing Statistical Significance”Physical Medicine and Rehabilitation, Vol. 2 (June), 559-562 which discusses the need to look carefully at within-group differences as well as between-group differences, and at sub-group significance compared to interaction. She concludes: ‘Readers should have a particularly high index of suspicion for controlled studies that fail to report between-group comparisons, because these likely represent attempts to “spin” null results.”
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    and at sub-group significance compared to interaction. She concludes: 'Readers should have a particularly high index of suspicion for controlled studies that fail to report between-group comparisons, because these likely represent attempts to "spin" null results."
Theron DesRosier

How Group Dynamics May Be Killing Innovation - Knowledge@Wharton - 5 views

  • Christian Terwiesch and Karl Ulrich argue that group dynamics are the enemy of businesses trying to develop one-of-a-kind new products, unique ways to save money or distinctive marketing strategies.
  • Terwiesch, Ulrich and co-author Karan Girotra, a professor of technology and operations management at INSEAD, found that a hybrid process -- in which people are given time to brainstorm on their own before discussing ideas with their peers -- resulted in more and better quality ideas than a purely team-oriented process.
    • Theron DesRosier
       
      This happens naturally when collaboration is asynchronous.
    • Theron DesRosier
       
      They use the term "team oriented process" but what they mean, I think, is a synchronous, face to face, brainstorming session.
  • Although several existing experimental studies criticize the team brainstorming process due to the interference of group dynamics, the Wharton researchers believe their work stands out due to a focus on the quality, in addition to the number, of ideas generated by the different processes -- in particular, the quality of the best idea.
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  • "The evaluation part is critical. No matter which process we used, whether it was the [team] or hybrid model, they all did significantly worse than we hoped [in the evaluation stage]," Terwiesch says. "It's no good generating a great idea if you don't recognize the idea as great. It's like me sitting here and saying I had the idea for Amazon. If I had the idea but didn't do anything about it, then it really doesn't matter that I had the idea."
  • He says an online system that creates a virtual "suggestion box" can accomplish the same goal as long as it is established to achieve a particular purpose.
  • Imposing structure doesn't replace or stifle the creativity of employees, Ulrich adds. In fact, the goal is to establish an idea generation process that helps to bring out the best in people. "We have found that, in the early phases of idea generation, providing very specific process guideposts for individuals [such as] 'Generate at least 10 ideas and submit them by Wednesday,' ensures that all members of a team contribute and that they devote sufficient creative energy to the problem."
  • The results of the experiment with the students showed that average quality of the ideas generated by the hybrid process were better than those that came from the team process by the equivalent of roughly 30 percentage points.
  • in about three times more ideas than the traditional method.
  • "We find huge differences in people's levels of creativity, and we just have to face it. We're not all good singers and we're not all good runners, so why should we expect that we all are good idea generators?
  • They found that ideas built around other ideas are not statistically better than any random suggestion.
  • "In innovation, variance is your friend. You want wacky stuff because you can afford to reject it if you don't like it. If you build on group norms, the group kills variance."
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    Not as radical as it first seems, but pertains to much of our work and the work of others.
Theron DesRosier

P2PU - Peer 2 Peer University / FrontPage - 0 views

shared by Theron DesRosier on 13 Aug 09 - Cached
  • The Peer 2 Peer University (P2PU) is an online community of open study groups for short university-level courses. Think of it as online book clubs for open educational resources. The P2PU helps you navigate the wealth of open education materials that are out there, creates small groups of motivated learners, and supports the design and facilitation of courses. Students and tutors get recognition for their work, and we are building pathways to formal credit as well.
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    "The Peer 2 Peer University (P2PU) is an online community of open study groups for short university-level courses. Think of it as online book clubs for open educational resources. The P2PU helps you navigate the wealth of open education materials that are out there, creates small groups of motivated learners, and supports the design and facilitation of courses. Students and tutors get recognition for their work, and weare building pathways to formal credit as well."
Joshua Yeidel

Effect Size Resources - CEM - 3 views

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    "'Effect Size' is a way of expressing the difference between two groups. In particular, if the groups have been systematically treated differently in an experiment, the Effect Size indicates how effective the experimental treatment was."
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    An interesting approach to comparing parametric statistics between groups
S Spaeth

SPage- The Difference: How the Power of Diversity Creates Better Groups - 0 views

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    In this landmark book, Scott Page redefines the way we understand ourselves in relation to one another.The Differenceis about how we think in groups--and how our collective wisdom exceeds the sum of its parts. Why can teams of people find better solutions than brilliant individuals working alone? And why are the best group decisions and predictions those that draw upon the very qualities that make each of us unique? The answers lie in diversity--not what we look like outside, but what we look like within, our distinct tools and abilities. The Differencereveals that progress and innovation may depend less on lone thinkers with enormous IQs than on diverse people working together and capitalizing on their individuality.
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    We (Jayme Jacobson, Nils Peterson, and I) have been talking about this a lot lately. This article reminded me of another article in the Harvard Business Review by Lakhani and Jeppesen on crowdsourcing. They found that successful Innocentive solvers often worked in disciplines removed from the posted problem. "Radical innovations often happen at the intersections of disciplines…The more diverse the problem solving population, the more likely the problem will be solved." Lakhani and Jeppesen May 2007 Harvard Business Review Thanks Stephen
Gary Brown

Ranking Employees: Why Comparing Workers to Their Peers Can Often Backfire - Knowledge@... - 2 views

  • We live in a world full of benchmarks and rankings. Consumers use them to compare the latest gadgets. Parents and policy makers rely on them to assess schools and other public institutions,
  • "Many managers think that giving workers feedback about their performance relative to their peers inspires them to become more competitive -- to work harder to catch up, or excel even more. But in fact, the opposite happens," says Barankay, whose previous research and teaching has focused on personnel and labor economics. "Workers can become complacent and de-motivated. People who rank highly think, 'I am already number one, so why try harder?' And people who are far behind can become depressed about their work and give up."
  • mong the companies that use Mechanical Turk are Google, Yahoo and Zappos.com, the online shoe and clothing purveyor.
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  • Nothing is more compelling than data from actual workplace settings, but getting it is usually very hard."
  • Instead, the job without the feedback attracted more workers -- 254, compared with 76 for the job with feedback.
  • "This indicates that when people are great and they know it, they tend to slack off. But when they're at the bottom, and are told they're doing terribly, they are de-motivated," says Barankay.
  • In the second stage of the experiment
  • The aim was to determine whether giving people feedback affected their desire to do more work, as well as the quantity and quality of their work.
  • Of the workers in the control group, 66% came back for more work, compared with 42% in the treatment group. The members of the treatment group who returned were also 22% less productive than the control group. This seems to dispel the notion that giving people feedback might encourage high-performing workers to work harder to excel, and inspire low-ranked workers to make more of an effort.
  • it seems that people would rather not know how they rank compared to others, even though when we surveyed these workers after the experiment, 74% said they wanted feedback about their rank."
  • top performers move on to new challenges and low performers have no viable options elsewhere.
  • feedback about rank is detrimental to performance,"
  • it is well documented that tournaments, where rankings are tied to prizes, bonuses and promotions, do inspire higher productivity and performance.
  • "In workplaces where rankings and relative performance is very transparent, even without the intervention of management ... it may be better to attach financial incentives to rankings, as interpersonal comparisons without prizes may lead to lower effort," Barankay suggests. "In those office environments where people may not be able to assess and compare the performance of others, it may not be useful to just post a ranking without attaching prizes."
  • "The key is to devote more time to thinking about whether to give feedback, and how each individual will respond to it. If, as the employer, you think a worker will respond positively to a ranking and feel inspired to work harder, then by all means do it. But it's imperative to think about it on an individual level."
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    the conflation of feedback with ranking confounds this. What is not done and needs to be done is to compare the motivational impact of providing constructive feedback. Presumably the study uses ranking in a strictly comparative context as well, and we do not see the influence of feedback relative to an absolute scale. Still, much in this piece to ponder....
Joshua Yeidel

Strategic Directives for Learning Management System Planning | EDUCAUSE - 1 views

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    A largely sensible strategic look at LMS in general. "The LMS, because of its integration with other major institutional technology systems, has itself become an enterprise-wide system. As such, higher education leaders must closely 7 monitor the possible tendency for LMSs to contribute only to maintaining the educational status quo.40 The most radical suggestion for future LMS use would dissolve the commercially enforced "course-based" model of LMS use entirely, allowing for the creation of either larger (departmental) or smaller (study groups) units of LMS access, as the case may require. This ability to cater to context awareness is perhaps the feature most lacking in most LMS products. As noted in a study in which mobile or handheld devices were used to assemble ad hoc study groups,41 this sort of implementation is entirely possible in ways that don't necessarily require interaction through an LMS interface." Requires EDUCAUSE login (free to WSU)
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    The EDUCAUSE paper suggests "dissolv[ing] the commercially enforced 'course-based' model of LMS". How about dissolving the "course-based" model of higher education on which the commercial LMS is based?
Theron DesRosier

Didn't I tell you that? - 0 views

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    Chamberlain High School is small inner-city school within a school in a large urban district. Over its five years of existence, Chamberlain administrators have enlisted the aid of outside partners to help them realize the vision of an interdisciplinary environmental science theme based school. Partners include many university-based groups, as well as groups such as National Public Radio's Living on Earth, the Urban Ecology Institute (a non-profit university-based organization), and a local environmental literacy program. This study was undertaken to understand some of the dynamics behind those partnerships. Using activity theory as an analytical lens we found a set of tensions that drove many of the changes that have occurred between the school and its partners. In this paper we document these tensions so others who are working in similar situations will be able to leverage our experience and findings to support urban school change.
Peggy Collins

Haystack Group - 0 views

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    Our goal is to make it easier for people to collect, organize, find, visualize, and share their information. One of the biggest obstacles to such information management is the rigid, centrally-planned information models and user interfaces of existing applications and web sites. The data people use in the real world is rarely so well-formed. It is full of exceptions and idiosyncrasies. Our group develops tools for the web and desktop that can flex to hold and present whatever information a user considers important, in whatever way the user considers most effective.
Matthew Tedder

East Bay Express : Print This Story - 0 views

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    It's not the African American aspect of this story that interests me. It is the aspect of attitudes--whether they be ethnically correlated or not. Politically problematic but I think this includes, at its core, crucial factors to consider. I think this research would have been better conducted not in consideration of ethnicity but rather groups as determined by criteria derived from factor analysis. To me, the point is that memes matter. Both behavioral and belief memes can characterize groups of friends (a better unit of study than a nebulous ethnicity) and provide them with a baseline of comparative likelinesses in achievements of various kinds.
Joshua Yeidel

Start-Up Aspires to Make the World 'One Big Study Group' - Wired Campus - The Chronicle... - 2 views

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    A more modest attempt to "open up" education, using a study-group model rather than a course model like P2PU.
Gary Brown

International Group Announces Audit of University Rankings - International - The Chroni... - 1 views

  • the organizer unveiled a project that would effectively rank the rankers.
  • As rankings proliferate around the world, they are increasingly having a direct impact on the decisions of students, academic staff, institutions, and policy makers, but each of those groups differs in its use of rankings and the sophistication it brings to evaluating them.
  • IREG's principles, which emphasize clarity and openness in the purposes and goals of rankings, the design and weighting of indicators, the collection and processing of data, and the presentation of results.
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  • Whether the audit will actually work remains to be seen. Many of the people who attended the meeting expressed deep skepticism and unease about how effectively a rigorous and independent audit procedure could be applied.
  • rankings have become an intensely competitive business, and that any audit procedures would need to be clear and open enough to ensure that competitors were not pronouncing on one another's work.
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    Sheesh
Corinna Lo

Facebook | Facebook Town Hall: Proposed Statement of Rights & Responsibilities - 0 views

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    Facebook has created this group to publish, and solicit comments regarding, its proposed Statement of Rights and Responsibilities (the "Statement").
Nils Peterson

Balancing the Two Faces of ePortfolios - Researching Lifelong ePortfolios and Web 2.0 |... - 0 views

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    Helen Barrett attempting to balance portfolio typologies
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    diagram of relationship between workspace and showcase portfolio
Nils Peterson

Innovating the 21st-Century University: It's Time! (EDUCAUSE Review) | EDUCAUSE - 4 views

  • change is required in two vast and interwoven domains that permeate the deep structures and operating model of the university: (1) the value created for the main customers of the university (the students); and (2) the model of production for how that value is created. First we need to toss out the old industrial model of pedagogy (how learning is accomplished) and replace it with a new model called collaborative learning. Second we need an entirely new modus operandi for how the subject matter, course materials, texts, written and spoken word, and other media (the content of higher education) are created.
  • Research shows that mutual exploration, group problem solving, and collective meaning-making produce better learning outcomes and understanding overall. Brown and Adler cite a study by Richard J. Light, of the Harvard Graduate School of Education: "Light discovered that one of the strongest determinants of students' success in higher education . . . was their ability to form or participate in small study groups. Students who studied in groups, even only once a week, were more engaged in their studies, were better prepared for class, and learned significantly more than students who worked on their own."
  • Second, the web enables students to collaborate with others independent of time and geography. Finally, the web represents a new mode of production for knowledge, and that changes just about everything regarding how the "content" of college and university courses are created.
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  • As Seymour Papert, one of the world's foremost experts on how technology can provide new ways to learn, put it: "The scandal of education is that every time you teach something, you deprive a [student] of the pleasure and benefit of discovery."14 Students need to integrate new information with the information they already have — to "construct" new knowledge structures and meaning.
  • Universities need an entirely new modus operandi for how the content of higher education is created. The university needs to open up, embrace collaborative knowledge production, and break down the walls that exist among institutions of higher education and between those institutions and the rest of the world.To do so, universities require deep structural changes — and soon. More than three years ago, Charles M. Vest published "Open Content and the Emerging Global Meta-University" in EDUCAUSE Review. In his concluding paragraph, Vest offered a tantalizing vision: "My view is that in the open-access movement, we are seeing the early emergence of a meta-university — a transcendent, accessible, empowering, dynamic, communally constructed framework of open materials and platforms on which much of higher education worldwide can be constructed or enhanced. The Internet and the Web will provide the communication infrastructure, and the open-access movement and its derivatives will provide much of the knowledge and information infrastructure." Vest wrote that the meta-university "will speed the propagation of high-quality education and scholarship. . . . The emerging meta-university, built on the power and ubiquity of the Web and launched by the open courseware movement, will give teachers and learners everywhere the ability to access and share teaching materials, scholarly publications, scientific works in progress, teleoperation of experiments, and worldwide collaborations, thereby achieving economic efficiencies and raising the quality of education through a noble and global endeavor."17
  • Used properly, wikis are tremendously powerful tools to collaborate and co-innovate new content. Tapscott wrote the foreword for a book called We Are Smarter Than Me (2008). The book, a best-seller, was written by Barry Libert, Jon Spector, and more than 4,000 people who contributed to the book's wiki. If a global collaboration can write a book, surely one could be used to create a university course. A professor could operate a wiki with other teachers. Or a professor could use a wiki with his or her students, thereby co-innovating course content with the students themselves. Rather than simply being the recipients of the professor's knowledge, the students co-create the knowledge on their own, which has been shown to be one of the most effective methods of learning.
  • The student might enroll in the primary college in Oregon and register to take a behavioral psychology course from Stanford University and a medieval history course from Cambridge. For these students, the collective syllabi of the world form their menu for higher education. Yet the opportunity goes beyond simply mixing and matching courses. Next-generation faculty will create a context whereby students from around the world can participate in online discussions, forums, and wikis to discover, learn, and produce knowledge as networked individuals and collectively.
  • But what about credentials? As long as the universities can grant degrees, their supremacy will never be challenged." This is myopic thinking. The value of a credential and even the prestige of a university are rooted in its effectiveness as a learning institution. If these institutions are shown to be inferior to alternative learning environments, their capacity to credential will surely diminish. How much longer will, say, a Harvard undergraduate degree, taught mostly through lectures by teaching assistants in large classes, be able to compete in status with the small class size of liberal arts colleges or the superior delivery systems that harness the new models of learning?
  • As part of this, the academic journal should be disintermediated and the textbook industry eliminated. In fact, the word textbook is an oxymoron today. Content should be multimedia — not just text. Content should be networked and hyperlinked bits — not atoms. Moreover, interactive courseware — not separate "books" — should be used to present this content to students, constituting a platform for every subject, across disciplines, among institutions, and around the world. The textbook industry will never reinvent itself, however, since legacy cultures and business models die hard. It will be up to scholars and students to do this collectively.
  • Ultimately, we will need more objective measures centered on students' learning performance.
Gary Brown

News: No Letup From Washington - Inside Higher Ed - 1 views

  • Virtually all of the national higher education leaders who spoke to the country's largest accrediting group sent a version of the same message: The federal government is dead serious about holding colleges and universities accountable for their performance, and can be counted on to impose undesirable requirements if higher education officials don't make meaningful changes themselves.
  • "This is meant to be a wakeup call," Molly Corbett Broad, president of the American Council on Education, said in Monday's keynote address
  • I believe it’s wise for us to assume they will have little reservation about regulating higher education now that they know it is too important to fail."
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  • Obama administration will be tough on colleges because its officials value higher education and believe it needs to perform much better, and successfully educate many more students, to drive the American economy.
  • In her own speech to the Higher Learning Commission’s members on Sunday, Sylvia Manning, the group’s president, cited several signs that the new administration seemed willing to delve into territory that not long ago would have been viewed as off-limits to federal intrusion. Among them: A recently published “draft” of a guide to accreditation that many accrediting officials believe is overly prescriptive. A just-completed round of negotiations over proposed rules that deal with the definition of a “credit hour” and other issues that touch on academic quality -- areas that have historically been the province of colleges and their faculties. And, of special relevance for the Higher Learning Commission, a trio of critical letters from the Education Department’s inspector general challenging the association’s policies and those of two other regional accreditors on key matters -- and in North Central’s case, questioning its continued viability. With that stroke, Manning noted, the department’s newfound activism “has come to the doorstep, or into the living room, of HLC.”
  • Pressure to measure student learning -- to find out which tactics and approaches are effective, which create efficiency without lowering results -- is increasingly coming from what Broad called the Obama administration's "kitchen cabinet," foundations like the Lumina Foundation for Education (which she singled out) to which the White House and Education Department are increasingly looking for education policy help.
  • She cited an October speech in which the foundation's president, Jamie P. Merisotis, said that student learning should be recognized as the "primary measure of quality in higher education," and heralded the European Union's Bologna process as a potential path for making that so
  • we cannot lay low and hope that the glare of the spotlight will eventually fall on others," Broad told the Higher Learning Commission audience.
  • While higher ed groups have been warned repeatedly that they must act before Congress next renews the Higher Education Act -- a process that will begin in earnest in two or three years -- the reality is that politicians in Washington no longer feel obliged to hold off on major changes to higher education policy until that main law is reviewed. Congress has passed "seven major pieces of legislation" related to higher education in recent years, and "I wish I could tell you that the window is open" until the next reauthorization, Broad said. "But we cannot presume that we have the luxury of years within which to get our collective house in order. We must act quickly."
  • But where will such large-scale change come from? The regional accreditors acting together to align their standards? Groups of colleges working together to agree on a common set of learning outcomes for general education, building on the work of the American Association of Colleges and Universities? No answers here, yet.
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    Note the positions of the participants
S Spaeth

Main Page - OpenWetWare - 0 views

  • sharing of information, know-how, and wisdom among researchers and groups who are working in biology & biological engineering.
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    OpenWetWare is an effort to promote the sharing of information, know-how, and wisdom among researchers and groups who are working in biology & biological engineering. Learn more about us. If you would like edit access, would be interested in helping out, or want your lab website hosted on OpenWetWare, please join us.
Kimberly Green

News: Class Advantage - Inside Higher Ed - 0 views

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    Re SAT scores and college admissions: … Parents of all economic classes want their children to succeed, but the wealthier ones "better understand the postsecondary landscape and competitive admission process and they invest in resources to promote college attendance," she [Alon] writes. As a result test score gaps of high school seniors -- grouped by economic background -- have grown during recent years. Alon writes that as long as college admissions remains competitive, such trends will continue -- with wealthier parents finding ways to improve performance for their children, no matter what measures colleges use to sort applicants.
Gary Brown

Groups Say Governing Boards Should Be More Involved in Process - Government - The Chron... - 1 views

  • While the law is not as sweeping as many institutions and accreditors had feared it would be (accreditors, for example, won't be required to set specific standards for academic performance), the groups issuing the statement Tuesday said they want to make sure that academic institutions remain in control of the process
Gary Brown

Declining Study Time Signals Falling Standards, Report Says - The Ticker - The Chronicl... - 0 views

shared by Gary Brown on 06 Aug 10 - Cached
  • The amount of time spent studying has fallen drastically among full-time students in all demographic groups, whether they work or not, at all types of four-year colleges, according to a report released on Thursday by the American Enterprise Institute.
  • they cater to students' preferences for leisure, the report says, a shift that may slow economic growth.
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    Perhaps a partial explanation for resistance to innovations that promote authentic and group work?
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