Category: R 2013 Analyze Student Exam Items using IRT Oct 25 2013 Subset a Vector in R Oct 22 2013 Easy Sweave for LaTeX and R Aug 16 2013 Descriptive Statistics with the Psych Package in R Jun 29 2013 How can I do vlookup in R? Jun 28 2013 Repeated Measures ANOVA in R Jun 28 2013 Graphing Error Bars for Repeated-Measures Variables with ggplot2 Jun 27 2013