Group items tagged

Whether individual Likert items can be considered as interval-level data, or whether they should be considered merely ordered-categorical data is the subject of disagreement. Many regard such items only as ordinal data, because, especially when using only five levels, one cannot assume that respondents perceive all pairs of adjacent levels as equidistant. On the other hand, often (as in the example above) the wording of response levels clearly implies a symmetry of response levels about a middle category; at the very least, such an item would fall between ordinal- and interval-level measurement; to treat it as merely ordinal would lose information. Further, if the item is accompanied by a visual analog scale, where equal spacing of response levels is clearly indicated, the argument for treating it as interval-level data is even stronger.

When treated as ordinal data, Likert responses can be collated into bar charts, central tendency summarised by the median or the mode (but some would say not the mean), dispersion summarised by the range across quartiles (but some would say not the standard deviation), or analyzed using non-parametric tests, e.g. chi-square test, Mann–Whitney test, Wilcoxon signed-rank test, or Kruskal–Wallis test.[4] Parametric analysis of ordinary averages of Likert scale data is also justifiable by the Central Limit Theorem, although some would disagree that ordinary averages should be used for Likert scale data.

This question has concerned western thinkers at least since Plato (5th-4th century BCE). It has also concerned thinkers in other cultural traditions: Confucius (6th-5th century BCE); China’s legalist tradition; and India’s Kautilya (4th-3rd century BCE). The perspective here is that of the contemporary democratic west.

The core purpose of the state is protection. This view would be shared by everybody, except anarchists, who believe that the protective role of the state is unnecessary or, more precisely, that people can rely on purely voluntary arrangements.

Contemporary Somalia shows the horrors that can befall a stateless society. Yet horrors can also befall a society with an over-mighty state. It is evident, because it is the story of post-tribal humanity that the powers of the state can be abused for the benefit of those who control it.

Dozens of freshmen at Singapore Management University spent one evening last week learning how to "wiki," or use the software that lets large numbers of people write and edit class projects online. Though many said experiencing a public editing process similar to that of Wikipedia could prove valuable, some were wary of the collaborative tool, with its public nature and the ability to toss out or revise the work of their classmates.

It puts students in the awkward position of having to publicly correct a peer, which can cause the corrected person to lose face.

"You have to be more aware of others and have a sensitivity to others."

What is the one bit of science from your field that you think everyone should know?David Attenborough: The unity of life.Richard Dawkins: The unity of life that comes about through evolution, since we're all descended from a single common ancestor. It's almost too good to be true, that on one planet this extraordinary complexity of life should have come about by what is pretty much an intelligible process. And we're the only species capable of understanding it.

RD: I know you're working on a programme about Cambrian and pre-Cambrian fossils, David. A lot of people might think, "These are very old animals, at the beginning of evolution; they weren't very good at what they did." I suspect that isn't the case?DA: They were just as good, but as generalists, most were ousted from the competition.RD: So it probably is true there's a progressive element to evolution in the short term but not in the long term – that when a lineage branches out, it gets better for about five million years but not 500 million years. You wouldn't see progressive improvement over that kind of time scale.DA: No, things get more and more specialised. Not necessarily better.RD: The "camera" eyes of any modern animal would be better than what had come before.DA: Certainly... but they don't elaborate beyond function. When I listen to a soprano sing a Handel aria with an astonishing coloratura from that particular larynx, I say to myself, there has to be a biological reason that was useful at some stage. The larynx of a human being did not evolve without having some function. And the only function I can see is sexual attraction.RD: Sexual selection is important and probably underrated.DA: What I like to think is that if I think the male bird of paradise is beautiful, my appreciation of it is precisely the same as a female bird of paradise.

People say Richard Feynman had one of these extraordinary minds that could grapple with ideas of which I have no concept. And you hear all the ancillary bits – like he was a good bongo player – that make him human. So I admire this man who could not only deal with string theory but also play the bongos. But he is beyond me. I have no idea what he was talking of.

This retraction notice made me go, "WTF were you folks thinking?"

Here's the text of the retraction notice: This article has been retracted. Please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy). Reason: This article has been retracted at the request of the editor as the authors have plagiarised part of several papers that had already appeared in several journals. One of the conditions of submission of a paper for publication is that authors declare explicitly that their work is original and has not appeared in a publication elsewhere. Re-use of any data should be appropriately cited. As such this article represents a severe abuse of the scientific publishing system. The scientific community takes a very strong view on this matter and we apologise to readers of the journal that this was not detected during the submission process. From a limited, non-exhaustive check of the text, several elements of the text had been plagiarised from the following list of sources: Dihydroxyacetone - Wikipedia, the free encyclopedia StateMaster - Encyclopedia: Dihydroxyacetone

From a quick scan, I found this section in the paper ... In the 1950s, Eva Wittgenstein at the University of Cincinnati did further research with dihydroxyacetone. Her studies involved using dihydroxyacetone as an oral drug for treating children with glycogen storage disease (Wittgenstein and Berry, 1960). The children received large oral doses of dihydroxyacetone, and sometimes spit or spilled the substance onto their skin. Healthcare workers noticed that the skin turned brown after a few hours of dihydroxyacetone exposure. Eva Wittgenstein continued to experiment with this unique substance, painting dihydroxyacetone liquid solutions onto her own skin. She was able to consistently reproduce the pigmentation effect, and noted that dihydroxyacetone did not penetrate beyond the stratum corneum, or dead skin surface layer. which is very similar to this section in the Wikipedia entry: In the 1950s Eva Wittgenstein at the University of Cincinnati did further research with dihydroxyacetone.[4][5][6][7] Her studies involved using DHA as an oral drug for assisting children with glycogen storage disease. The children received large doses of DHA by mouth, and sometimes spat or spilled the substance onto their skin. Healthcare workers noticed that the skin turned brown after a few hours of DHA exposure. Eva Wittgenstein continued to experiment with this unique substance, painting DHA liquid solutions onto her own skin. She was able to consistently reproduce the pigmentation effect, and noted that DHA did not penetrate beyond the stratum corneum, or dead skin surface layer.

When I use the term denial industry, I'm referring to those who are paid to say that man-made global warming isn't happening. The great majority of people who believe this have not been paid: they have been duped. Reading Climate Cover-Up, you keep stumbling across familiar phrases and concepts which you can see every day on the comment threads. The book shows that these memes were planted by PR companies and hired experts.

The second case study reveals how Dr Patrick Michaels, one of a handful of climate change deniers with a qualification in climate science, has been lavishly paid by companies seeking to protect their profits from burning coal.

none of the media outlets who use him as a commentator – including the Guardian – has disclosed this interest at the time of his appearance. Michaels is one of many people commenting on climate change who presents himself as an independent expert while being secretly paid for his services by fossil fuel companies.

wrote a piece about James Delingpole's unfortunate appearance on the BBC program Horizon on Monday. In that piece I refered to one of his own Telegraph articles in which he criticizes renowned sceptic Dr Ben Goldacre for betraying the principles of scepticism in his regard of the climate change debate. That article turns out to be rather instructional as it highlights perfectly the difference between real scepticism and the false scepticism commonly described as denialism.

It appears that James has tremendous respect for Ben Goldacre, who is a qualified medical doctor and has written a best-selling book about science scepticism called Bad Science and continues to write a popular Guardian science column. Here's what Delingpole has to say about Dr Goldacre: Many of Goldacre’s campaigns I support. I like and admire what he does. But where I don’t respect him one jot is in his views on ‘Climate Change,’ for they jar so very obviously with supposed stance of determined scepticism in the face of establishment lies.

Scepticism is not some sort of rebellion against the establishment as Delingpole claims. It is not in itself an ideology. It is merely an approach to evaluating new information. There are varying definitions of scepticism, but Goldacre's variety goes like this: A sceptic does not support or promote any new theory until it is proven to his or her satisfaction that the new theory is the best available. Evidence is examined and accepted or discarded depending on its persuasiveness and reliability. Sceptics like Ben Goldacre have a deep appreciation for the scientific method of testing a hypothesis through experimentation and are generally happy to change their minds when the evidence supports the opposing view. Sceptics are not true believers, but they search for the truth. Far from challenging the established scientific consensus, Goldacre in Bad Science typcially defends the scientific consensus against alternative medical views that fall back on untestable positions. In science the consensus is sometimes proven wrong, and while this process is imperfect it eventually results in the old consensus being replaced with a new one.

The 10:23 demonstrations and the CBC Marketplace coverage have elicited fascinating case studies in CAM professionalism. Rather than offering any new information or evidence about homeopathy itself, some homeopaths have spuriously accused skeptical groups of being malicious Big Pharma shills.

Mike Adams of the Natural News website

has decided to provide his own coverage of the 10:23 campaign

I return to the Guardian online site expressly to search for those elusive articles on Wisconsin. The main page has none. I click on News – US, and there are none. I click on ‘Commentary is Free’- US, and find one article on protests in Ohio. I go to the New York Times online site. Earlier, on my phone, I had seen one article at the bottom of the main page on Wisconsin. By the time I managed to get on my computer to find it again however, the NYT main page was quite devoid of any articles on the protests at all. I am stumped; clearly, I have to reconfigure my daily news sources and reading diet.

It is not that the media is not covering the protests in Wisconsin at all – but effective media coverage in the US at least, in my view, is as much about volume as it is about substantive coverage. That week, more prime-time slots and the bulk of the US national attention were given to Charlie Sheen and his crazy antics (whatever they were about, I am still not too sure) than to Libya and the rest of the Middle East, or more significantly, to a pertinent domestic issue, the teacher protests  - not just in Wisconsin but also in other cities in the north-eastern part of the US.

In the March 2nd episode of The Colbert Report, it was shown that the Fox News coverage of the Wisconsin protests had re-used footage from more violent protests in California (the palm trees in the background gave Fox News away). Bill O’Reilly at Fox News had apparently issued an apology – but how many viewers who had seen the footage and believed it to be on-the-ground footage of Wisconsin would have followed-up on the report and the apology? And anyway, why portray the teacher protests as violent?

I got an email from a science teacher about a 13-year-old pupil. Both have to remain anonymous. This pupil wrote an article about Brain Gym for her school paper, explaining why it's nonsense: the essay is respectful, straightforward, and factual. But the school decided they couldn't print it, because it would offend teachers in the junior school who use Brain Gym.Now, this is weakminded, and perhaps even vicious. More interesting, though, is how often children are able to spot bullshit, and how often adults want to shut them up.

Emily Rosa is the youngest person ever to have published a scientific paper in JAMA , one of the most influential medical journals in the world. At the age of nine she saw a TV programme about nurses who practise "Therapeutic Touch", claiming they can detect and manipulate a "human energy field" by hovering their hands above a patient.

Rosa conceived and executed an experiment to test if they really could detect this "field". Twenty-one experienced practitioners put their palms on a table, behind a screen. Rosa flipped a coin, hovered her hand over the therapist's left or right palm accordingly, and waited for them to say which it was. The therapists performed no better than chance, and with 280 attempts there was sufficient statistical power to show that these claims were bunk. Therapeutic Touch practitioners, including some in university posts, were deeply unhappy: they insisted loudly that JAMA was wrong to publish the study.

The history of Western moral philosophy includes numerous attempts to ground ethics in one rational principle, standard, or rule. This narrative stretches back 2,500 years to the Greeks, who were interested mainly in virtue ethics and the moral character of the person. The modern era has seen two major additions. In 1785, Immanuel Kant introduced the categorical imperative: act only under the assumption that what you do could be made into a universal law. And in 1789, Jeremy Bentham proposed utilitarianism: work toward the greatest happiness of the greatest number of people (the “utility” principle).

Many people now think projects to build a reasonable and coherent moral system are doomed. Still, most secular and religious people reject the alternative of moral relativism, and have spent much ink criticizing it (among my favorite books on the topic is Moral Relativism by Stephen Lukes). The most recent and controversial work in this area comes from Sam Harris. In The Moral Landscape, Harris argues for a morality based on (a science of) well-being and flourishing, rather than religious dogma.

I am interested in another oft-heard criticism of Harris’ book, which is that words like “well-being” and “flourishing” are too general to form any relevant basis for morality. This criticism has some force to it, as these certainly are somewhat vague terms. But what if “well-being” and “flourishing” were to be used only as a starting point for a moral framework? These concepts would still put us on a better grounding than religious faith. But they cannot stand alone. Nor do they need to.

cryonics offers almost eternal life. To its critics, cryonics is pseudoscience; the idea that we could freeze someone today in such a way that future technology might be able to re-animate them is nothing more than wishful thinking on the desire to avoid death. Many who battle nonsense dressed as science have spoken out against it: see for example Nano Nonsense and Cryonics, a 2001 article by celebrated skeptic Michael Shermer; or check the Skeptic’s Dictionary or Quackwatch entries on the subject, or for more detail read the essay Cryonics–A futile desire for everlasting life by “Invisible Flan”.

And of course the pro-cryonics people have written reams and reams of material such as Ben Best’s Scientific Justification of Cryonics Practice on why they think this is exactly as plausible as I might think, and going into tremendous technical detail setting out arguments for its plausibility and addressing particular difficulties. It’s almost enough to make you want to sign up on the spot. Except, of course, that plenty of totally unscientific ideas are backed by reams of scientific-sounding documents good enough to fool non-experts like me. Backed by the deep pockets of the oil industry, global warming denialism has produced thousands of convincing-sounding arguments against the scientific consensus on CO2 and AGW. T

Nano Nonsense and Cryonics goes for the nitty-gritty right away in the opening paragraph:To see the flaw in this system, thaw out a can of frozen strawberries. During freezing, the water within each cell expands, crystallizes, and ruptures the cell membranes. When defrosted, all the intracellular goo oozes out, turning your strawberries into runny mush. This is your brain on cryonics.This sounds convincing, but doesn’t address what cryonicists actually claim. Ben Best, President and CEO of the Cryonics Institute, replies in the comments:Strawberries (and mammalian tissues) are not turned to mush by freezing because water expands and crystallizes inside the cells. Water crystallizes in the extracellular space because more nucleators are found extracellularly. As water crystallizes in the extracellular space, the extracellular salt concentration increases causing cells to lose water osmotically and shrink. Ultimately the cell membranes are broken by crushing from extracellular ice and/or high extracellular salt concentration. […] Cryonics organizations use vitrification perfusion before cooling to cryogenic temperatures. With good brain perfusion, vitrification can reduce ice formation to negligible amounts.

I kicked off a recent episode of the Rationally Speaking podcast on the topic of transhumanism by defining it as “the idea that we should be pursuing science and technology to improve the human condition, modifying our bodies and our minds to make us smarter, healthier, happier, and potentially longer-lived.”

Massimo understandably expressed some skepticism about why there needs to be a transhumanist movement at all, given how incontestable their mission statement seems to be. As he rhetorically asked, “Is transhumanism more than just the idea that we should be using technologies to improve the human condition? Because that seems a pretty uncontroversial point.” Later in the episode, referring to things such as radical life extension and modifications of our minds and genomes, Massimo said, “I don't think these are things that one can necessarily have objections to in principle.”

There are a surprising number of people whose reaction, when they are presented with the possibility of making humanity much healthier, smarter and longer-lived, is not “That would be great,” nor “That would be great, but it's infeasible,” nor even “That would be great, but it's too risky.” Their reaction is, “That would be terrible.”

Merchant of Doubt is exactly what its subtitle says: a historical view of how a handful of scientists have obscured the truth on matters of scientific fact.

it was a very small group who were responsible for creating a great deal of doubt on a variety of issues. The book opens in 1953, where the tobacco industry began to take action to obscure the truth about smoking’s harmful effects, when its relationship to cancer first received widespread media attention.

The tobacco industry exploited scientific tendency to be conservative in drawing conclusions, to throw up a handful of cherry-picked data and misleading statistics and to “spin unreasonable doubt.” This tactic, combined with the media’s adherence to the “fairness doctrine” which was interpreted as giving equal time “to both sides [of an issue], rather than giving accurate weight to both sides” allowed the tobacco industry to delay regulation for decades.

society's answer to the question “Is it acceptable to hurt animals for our pleasure?” isn't always “No.” Odds are that most of the people who objected to the dog fighting and crush videos are frequent consumers of meat, milk, and eggs from industrialized farms. And the life of an animal in a typical industrialized farm is notoriously punishing. Many spend their lives in cages so confining they can barely move; ammonia fumes burn their eyes; their beaks or tails are chopped off to prevent them from biting each other out of stress; and the farm's conditions make many of them so sick or weak that they die in their cages or on the way to slaughter. As a society, however, we apparently believe that the pleasure we get from eating those animals makes their suffering worth it.

many people will object that eating animals isn’t a matter of pleasure at all, but of the need for sustenance. While that may have been true for our ancestors who survived by hunting wild animals, I don’t think it has much relevance to our current situation. First, it's questionable whether we actually do need to eat animal products in order to be healthy; the American Dietetic Association has given the thumbs up to vegetarian and even vegan diets. But even if you believe that some amount of animal product consumption is medically necessary, we could still buy from farms that raise their livestock much more humanely. It would cost more, but we could always compensate by cutting back on other luxuries, or simply by eating less meat. By any reasonable estimate, Americans could cut their meat consumption drastically with no ill effects on their health (and likely with many positive effects). Buying the sheer amount of meat that Americans do, at the low prices made possible by industrialized farms, is a luxury that can’t be defended with a “need for sustenance” argument. It’s about pleasure — the pleasure of eating more meat than strictly necessary for health, and the pleasure of saving money that can then be spent on other things we enjoy.

there are several reasons why people regard consumers of industrial farming differently than consumers of crush videos and dogfighting. The first has to do with the types of animals involved: pigs, cows, and chickens simply aren't as cute as dogs, bunnies, and kittens. I don't know how many people would explicitly cite that as the reason they're willing to inflict suffering on the former and not the latter, but it seems to play a role, even if people won't admit as much. People who have no qualms about a pig spending its life in a small, dark crate would nevertheless be outraged if a dog were treated in the same way.

Is it legitimate to cite one’s intuitions as evidence in a philosophical argument?

appeals to intuitions are ubiquitous in philosophy. What are intuitions? Well, that’s part of the controversy, but most philosophers view them as intellectual “seemings.” George Bealer, perhaps the most prominent defender of intuitions-as-evidence, writes, “For you to have an intuition that A is just for it to seem to you that A… Of course, this kind of seeming is intellectual, not sensory or introspective (or imaginative).”2 Other philosophers have characterized them as “noninferential belief due neither to perception nor introspection”3 or alternatively as “applications of our ordinary capacities for judgment.”4

Philosophers may not agree on what, exactly, intuition is, but that doesn’t stop them from using it. “Intuitions often play the role that observation does in science – they are data that must be explained, confirmers or the falsifiers of theories,” Brian Talbot says.5 Typically, the way this works is that a philosopher challenges a theory by applying it to a real or hypothetical case and showing that it yields a result which offends his intuitions (and, he presumes, his readers’ as well).

Perhaps like me, you watched the BBC Two Horizons program Monday night presented by Sir Paul Nurse, president of the Royal Society and Nobel Prize winning geneticist for his discovery of the genes of cell division.

James. He really believes there's some kind of mainstream science "warmist" conspiracy against the brave outliers who dare to challenge the consensus. He really believes that "climategate" is a real scandal. He fails to understand that it is a common practice in statistics to splice together two or more datasets where you know that the quality of data is patchy. In the case of "climategate", researchers found that indirect temperature measurements based on tree ring widths (the tree ring temperature proxy) is consistent with other proxy methods of recording temperature from before the start of the instrumental temperature record (around 1950) but begins to show a decline in temperature after that for reasons which are unclear. Actual temperature measurements however show the opposite. The researcher at the head of the climategate affair, Phil Jones, created a graph of the temperature record to include on the cover of a report for policy makers and journalists. For this graph he simply spliced together the tree ring proxy data up until 1950 with the recorded data after that using statistical techniques to bring them into agreement. What made this seem particularly dodgy was an email intercepted by a hacker in which Jones referred to this practice as a "Mike's Nature trick", referring to a paper published by his colleague Mike Hulme Michael Mann in the journal Nature. It is however nothing out of the ordinary. Delingpole and others have talked about how this "trick" was used here to "hide the decline" revealed by the other dataset, as though this was some sort of deception. The fact that all parties were found to have behaved ethically is simply further evidence of the global warmist conspiracy. Delingpole takes it further and casts aspersions on scientific consensus and the entire peer review process.

When Nurse asked Delingpole the very straightforward question of whether he would be willing to trust a scientific consensus if he required treatment for cancer, he could have said "Gee, that's an interesting question. Let me think about that and why it's different."

I predict that you will find this review informative. If you do, you will congratulate my foresight. If you don’t, you’ll forget I was wrong.

My playful intro summarizes the main thesis of Gardner’s excellent book, Future Babble: Why Expert Predictions Fail – and Why We Believe Them Anyway.

In Future Babble, the research area explored is the validity of expert predictions, and the primary researcher examined is Philip Tetlock. In the early 1980s, Tetlock set out to better understand the accuracy of predictions made by experts by conducting a methodologically sound large-scale experiment.