What's New in December, 2011

Stata

• FAQ: How can I do classical ANOVA designs using xtmixed? (Stata 12)
• FAQ: How can I do CFA with binary variables?
• FAQ: How can I perform mediation with multilevel data? (Method 2)

What's New in November, 2011

SPSS

• FAQ: How can I test differences in means using a cell means model?

Stata

• FAQ: How can I access the random effects after xtmixed using _diparm?
• FAQ: What are the saturated and baseline models in sem?

What's New in September, 2011

Stata

• FAQ: How can I understand a three-way interaction in ANOVA? (Stata 12) [revised]
• FAQ: How can I read Stata 12 data files in Stata 11?
• FAQ: How can I test simple effects in repeated measures models? (Stata 12) [revised]
• FAQ: How can I understand a 3-way continuous interaction? (Stata 12)

What's new in August, 2011

Stata

• Paper Example: Do self-report instruments allow meaningful comparisons across diverse population groups? Testing measurement invariance using the confirmatory factor analysis framework by Steven E. Gregorich
• FAQ: How can I understand a continuous by continuous interaction in logistic regression? (Stata 12)
• FAQ: How can I check measurement invariance using the sem command? (Stata 12)
• FAQ: How can I understand a categorical by continuous interaction in logistic regression? (Stata 12)
• FAQ: How can I understand a categorical by categorical interaction in logistic regression? (Stata 12)
• FAQ: How can I graph the results of the margins command? (Stata 12)
• FAQ: How can I understand a categorical by continuous interaction? (Stata 12)
• FAQ: How can I understand a continuous by continuous interaction? (Stata 12)
• FAQ: How can I read Excel files in Stata? (Stata 12)

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
  

What's new in February, 2011

Stata

• FAQ: How can I do power and robustness analyses for factorial anova? (Stata 11)

SPSS

• FAQ: How to create a variable that contains the number of reciprocal friends?