He grew up on an Arizona reservation.
Paul Torfs and Claudia Brauer not so short introduction More locally, I have taken tutorials originally written by Roger Ratcliff and various graduate students on how to do analysis of variance using S and adapated them to the R environment. This guide was developed to help others learn R, and also to help students in Research MethodsPersonality ResearchPsychometric TheoryStructural Equation Modelingor other courses do some basic statisics.
To download a copy of the software, go to the download section of the cran. A detailed pdf of how to download R and some of the more useful packages is available as part of the personality-project.
See his post here. He also has written various tutorials on using R for regression and analysis of variance. Their pages were very useful when I started to learn R. There is a growing number of text books that introduce R. Ripley and William N. For the psychometrically minded, my psychometrics text in progress has all of its examples in R.
The R help listserve is a very useful source of information.
Just lurking will lead to the answers for many questions. Much of what is included in this tutorial was gleaned from comments sent to the help list. The most frequently asked questions have been organized into a FAQ. The archives of the help group are very useful and should be searched before asking for help.
Jonathan Baron maintains a searchable database of the help list serve.
Back to Top General Comments R is not overly user friendly at first. Its error messages are at best cryptic. It is, however, very powerful and once partially mastered, easy to use.
And it is free. Even more important than the cost is that it is an open source language which has become the lingua franca of statistics and data analysis. That is, as additional modules are added, it becomes even more useful.
Modules included allow for multilevel hierarchical linear modeling, confirmatory factor analysis, etc. I believe that it is worth the time to learn how to use it. Li's guide is very helpful.
They include a one page pdf summary sheet of commands that is well worth printing out and using. A four page summary sheet of commands was contributed by Tom Short.Vignette Analysis I Clinical Psychology – Psychopathology.
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