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Raúl Sarrión

An R Introduction to Statistics | R Tutorial - 1 views

www.r-tutor.com

r statistics

shared by Raúl Sarrión on 22 Apr 13 - Cached
  • In an experiment study, various treatments are applied to test subjects and the response data is gathered for analysis. A critical tool for carrying out the analysis is the Analysis of Variance (ANOVA).
    • Raúl Sarrión
      Raúl Sarrión on 22 Apr 13
       
      El lenguaje de programación R se puede utilizar para realizar análisis de la varianza
    • Raúl Sarrión
      Raúl Sarrión on 22 Apr 13
       
      ANOVA
  • Raúl Sarrión on 22 Apr 13
     
    In an experiment study, various treatments are applied to test subjects and the response data is gathered for analysis. A critical tool for carrying out the analysis is
Juanjo Cristian

R, the Software, Finds Fans in Data Analysts - NYTimes.com - 0 views

www.nytimes.com/...07program.html

shared by Juanjo Cristian on 22 Apr 13 - No Cached
  • R describe it  as a supercharged version of  Microsoft’s Excel
  • R describe it  as a supercharged version of Microsoft’s Excel
  • R describe it  as a supercharged version of Microsoft’s Excel
  • ...26 more annotations...
  • R describe it  as a supercharged version of  Microsoft’s Excel
  • R describe it  as a supercharged version of
  • R describe it  as a supercharged version of  Microsoft’s Excel
  • R describe it  as a supercharged version of  Microsoft’s Excel
  • R describe it  as a supercharged version of  Microsoft’s Excel
  • is particularly useful because it contains a number of built-in mechanisms for organizing data, running calculations on the information and creating graphical representations of data sets.
  • familiar
  • familiar
  • It allows statisticians to do very intricate and complicated analyses without knowing the blood and guts of computing systems.”
  • It is also free.
  • R is an open-source program, and its popularity reflects a shift in the type of software used inside corporations
  • R is similar to other programming languages, like C, Java and Perl, in that it helps people perform a wide variety of computing tasks by giving them access to various commands.
  • R describe it  as a supercharged version of Microsoft’s Excel
  • Excel
  • Microsoft’s
  • version
  • supercharged
  • Some people familiar with R describe it
  • familiar
  • R first appeared in 1996, when the statistics professors Ross Ihaka and Robert Gentleman of the University of Auckland in New Zealand released the code as a free software package.
  • The popularity of R at universities could threaten SAS Institute, the privately held business software company that specializes in data analysis software. SAS, with more than $2 billion in annual revenue, has been the preferred tool of scholars and corporate managers.
  • Google, for example, taps R for help understanding trends in ad pricing and for illuminating patterns in the search data it collects.
  • Pfizer has created customized packages for R to let its scientists manipulate their own data during nonclinical drug studies rather than send the information off to a statistician.
  • Mr. Gentleman is applying R-based software, called Bioconductor, in work he is doing on computational biology at the Fred Hutchinson Cancer Research Center in Seattle.
    • Sébastien Sanchez
      Sébastien Sanchez on 25 Apr 13
       
      Artículo en NYTimes que habla de la creciente implantación del lenguaje de programación R en el ámbito empresarial. Explica como cada vez más, grandes empresas como Google empiezan a emplear este lenguaje de programación para todo tipo de propósitos (investigación comercial, data mining…).
    • Juanjo Cristian
      Juanjo Cristian on 01 May 13
       
      El lenguaje de programación R ha cautivado a gran parte de los analistas de datos debido a su potencial en el ámbito de la estadística especialmente. También es usado por grandes empresas como Google o Bank of America y por estadistas y científicos.
  • empresa 2013 on 22 Apr 13
     
    Se trata de un artículo del New York Times en el que describe la historia del lenguaje y diferentes empresas que lo utilizan y los usos que le dan, como Google y Pfizer.
Carlos Espinosa

Lenguaje R: ¿ - 1 views

  El Lenguaje R:   ¿Qué es R? R es un lenguaje y entorno de programación para análisis estadístico y gráfico. Se trata de un proyecto de software...

started by Carlos Espinosa on 30 Apr 13 no follow-up yet
Foe Solitario

Gran sitio de recursos de R - 1 views

www.ats.ucla.edu/r

data analysis statistics programming lenguaje R applied graphics

shared by Foe Solitario on 02 May 13 - Cached
Foe Solitario liked it
  • Foe Solitario on 02 May 13
     
    Dividido en 4 partes: Tópicos Análisis Links ¿Has visto?
  • ...2 more comments...
  • Foe Solitario on 02 May 13
     
    Tópicos Donde se puede encontrar desde una introducción al lenguaje, pasando por el FAQ, ejemplos de gráficos y fragmentos de código
  • Foe Solitario on 02 May 13
     
    Links Acerca de todo lo referente a la preparación del entorno en R
  • Foe Solitario on 02 May 13
     
    Análisis Estadísticos Ejemplos de análisis de datos y papers
  • Foe Solitario on 02 May 13
     
    ¿Has visto? Aplicaciones prácticas del modeladode datos con R
Enrique Diaz Romero

An Introduction to R - 1 views

stat.ethz.ch/...R-intro.html

shared by Enrique Diaz Romero on 24 Apr 13 - No Cached
    • nerub val
      nerub val on 24 Apr 13
       
      las carateristicas generales de R
    • nerub val
      nerub val on 24 Apr 13
       
      El desarrollo de R
  • R is an integrated suite of software facilities for data manipulation, calculation and graphical display. Among other things it has an effective data handling and storage facility, a suite of operators for calculations on arrays, in particular matrices, a large, coherent, integrated collection of intermediate tools for data analysis, graphical facilities for data analysis and display either directly at the computer or on hardcopy, and a well developed, simple and effective programming language (called ‘S’) which includes conditionals, loops, user defined recursive functions and input and output facilities. (Indeed most of the system supplied functions are themselves written in the S language.)
    • Enrique Diaz Romero
      Enrique Diaz Romero on 25 Jun 13
       
      El entorno de R entre otras cosas nos permite el uso y almacenamiento eficaz de datos, así como su análisis en forma de matrices, un gran numero de herramientas graficas y un lenguaje claro y sencillo de programación en el que podemos encontrar un gran numero de funciones.
  • ...4 more annotations...
  • his section presumes the reader has some familiarity with statistical methodology, in particular with regression analysis and the analysis of variance. Later we make some rather more ambitious presumptions, namely that something is known about generalized linear models and nonlinear regression. The requirements for fitting statistical models are sufficiently well defined to make it possible to construct general tools that apply in a broad spectrum of problems. R provides an interlocking suite of facilities that make fitting statistical models very simple. As we mention in the introduction, the basic output is minimal, and one needs to ask for the details by calling extractor functions.
  • When you use the R program it issues a prompt when it expects input commands. The default prompt is ‘>’, which on UNIX might be the same as the shell prompt, and so it may appear that nothing is happening. However, as we shall see, it is easy to change to a different R prompt if you wish. We will assume that the UNIX shell prompt is ‘$’.
  • R can be regarded as an implementation of the S language which was developed at Bell Laboratories by Rick Becker, John Chambers and Allan Wilks, and also forms the basis of the S-Plus systems. The evolution of the S language is characterized by four books by John Chambers and coauthors. For R, the basic reference is The New S Language: A Programming Environment for Data Analysis and Graphics by Richard A. Becker, John M. Chambers and Allan R. Wilks. The new features of the 1991 release of S are covered in Statistical Models in S edited by John M. Chambers and Trevor J. Hastie. The formal methods and classes of the methods package are based on those described in Programming with Data by John M. Chambers. See References, for precise references. There are now a number of books which describe how to use R for data analysis and statistics, and documentation for S/S-Plus can typically be used with R, keeping the differences between the S implementations in mind. See What documentation exists for R?.
  • R (“GNU S”), a language and environment for statistical computing and graphics. R is similar to the award-winning1 S system, which was developed at Bell Laboratories by John Chambers et al. It provides a wide variety of statistical and graphical techniques
    • Enrique Diaz Romero
      Enrique Diaz Romero on 25 Jun 13
       
      ¿Que es R y de donde viene? R nos lo presentan como un lenguaje y entorno que desciende del reconocido sistema S desarrollado por los laboratorios Bell, y que nos ofrece una serie de técnicas u herramientas para el análisis estadístico y gráfico
  • Enrique Diaz Romero on 25 Jun 13
     
    Introducción completa al lenguaje R de programación para análisis de datos estadísticos.
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