R is a statistical program/environment that can be used for statistical modeling or analysis. More information about R can be found on its About page on its home page.

Apart from the excellent documentation that can be found on R project’s page, below are some of the links that I find useful.

R Intro (pdfs)

If you cannot avoid using Excel.

Patrick Burns's “Spreadsheet Addiction” lists some common problems associated with Excel. He also has many tutorials pertaining to R under the “Tutorial” title on his page (link).

Statistics with Excel? page on Practical Stats webpage lists many problems with using Excel for statistical analysis.

Question 13 of the FAQ on SHELDUS's page lists one of the problems with sorting and selections in Excel. See part 2 of the question.

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Comments, questions, problem reports, suggestions welcome!