What's new in September, 2008

R

• Data Analysis Example: Zero-Inflated Poisson Regression
• Data Analysis Example: Zero-Inflated Negative Binomial Regression
• FAQ: How can I write a binary data file by column?

SAS

• FAQ: How can I create lag and lead variables in longitudinal data?

What's new in August, 2008

G*Power

• Data Analysis Example: One-way ANOVA Power Analysis
• Data Analysis Example: Multiple Regression Power Analysis

R

• Code Fragment: How can I simulate a network in R?

Sample Power

• Data Analysis Example: One-way ANOVA Power Analysis
• Data Analysis Example: Single-Sample T-Test Power Analysis
• Data Analysis Example: Paired T-test Power Analysis
• Data Analysis Example: Independent-Sample T-test Power Analysis
• Data Analysis Example: Two Independent Proportions Power Analysis
• Data Analysis Example: Multiple Regression Power Analysis

SAS

• FAQ: Given a knot location, how can I fit a piecewise model using Proc Transreg?
• FAQ: How can I recode my ID variable to be short and numeric?
• FAQ: How do I interpret odds ratios in logistic regression?
  

SPSS

• FAQ: How do I interpret odds ratios in logistic regression?
  

Stata

• FAQ: How can I find where to split a piecewise regression?