What's New in July, 2011

R

• FAQ: How can I test contrasts in R?
  
• Code Fragment: How can I loop through a list of strings as variables in a model?
  
• Code Fragment: How can I include Greek letters in my plot?
  
• Graphics by Example: Box plots using ggplot2
  
• Code Fragment: Overlaying errorbar on a jittered data points using ggplot2
  
• FAQ: How can I reshape my data in R?
  
• FAQ: How can I "collapse" my data in R?
  

SPSS

• FAQ: How can I get out-of-sample predicted values?
  
• Code Fragment: Looping without scratch variables in SPSS macros
  
• Code Fragment: Converting SAS or Stata dates to SPSS dates