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Background – time to upgrade to R 2.13.0 The news of the new release of R 2.13.0 is out, and the R blogosphere is buzzing. Bloggers posting excitedly about the new R compiler package that brin...

https://www.r-statistics.com/2011/04/how-to-upgrade-r-on-windows-7/

Looking at a project you didn’t touch for years poses many challenges. The less documentation and organization you had in your files, the more time you’ll have to spend tracing back what you ...

Update: This post has a follow-up for how to upgrade R on windows 7 explaining how to deal with permission issues. Background – how I heard that there is more then one way to upgrade R If you d...

In David Smith’s latest blog post (which, in a sense, is a continued response to the latest public attack on R), there was a comment by Barry that caught my eye. Barry wrote: Even I get caught ...

https://www.r-statistics.com/2010/04/the-difference-between-lettersc1na-and-letterscnana/

When analyzing a questionnaire, one often wants to view the correlation between two or more Likert questionnaire item’s (for example: two ordered categorical vectors ranging from 1 to 5). When ...

https://www.r-statistics.com/2010/04/correlation-scatter-plot-matrix-for-ordered-categorical-data/

Daniel Malter just shared on the R mailing list (link to the thread) his code for performing the Siegel-Tukey (Nonparametric) test for equality in variability. Excited about the find, I contacted...

My goal in this post is to give an overview of Friedman’s Test and then offer R code to perform post hoc analysis on Friedman’s Test results. (The R function can be downloaded from here) Pref...

https://www.r-statistics.com/2010/02/post-hoc-analysis-for-friedmans-test-r-code/

(The R code for Barnard’s exact test is at the end of the article, and you could also just download it from here, or from github) About Barnard’s exact test About half a year ago, I was study...