What's new in July, 2008

General

• FAQ: What is the coefficient of variation?
• FAQ: How do I interpret odds ratios in logistic regression?
• FAQ: How do I interpret a regression model when some variables are log transformed?

G*Power

• Data Analysis Example: Power analysis for paired sample t-test
• Data Analysis Example: Power analysis for one -sample t-test
• Data Analysis Example: Power analysis for two-group independent sample t-test
• Data Analysis Example: Two independent proportions power analysis

SAS

• FAQ: When using Proc Transreg, what are the defaults with pspline?
• FAQ: When using Proc Transreg, what are the defaults with spline?
• FAQ: When using Proc Transreg, what are the defaults with bspline?
• FAQ: How can I use find where to split a piecewise regression?

SPSS

• FAQ: How can I explain a three-way interaction in ANOVA?
• FAQ: How can I use the lmatrix subcommand to understand a three-way interaction in ANOVA?
• FAQ: How can I use aggregate and OMS to help explain a three-way interaction in ANOVA?
• Code Fragment: Renaming variables dynamically
• FAQ: How can I run a piecewise regression in SPSS?

Stata

• Code Fragment: Manually generate predicted probabilities from a multinomial logistic regression in Stata
• Code Fragment: Graphing predicted probabilities with an interaction of a binary variable and a continuous variable