What's new in December, 2012

Stata

• FAQ: How can I do moderated mediation with a categorical moderator in Stata?

What's new in November, 2012

General

• Introduction to Generalized Linear Mixed Models

What's new in September, 2012

Stata

• FAQ: How can you get 3-way, 4-way, 5-way or more cross tabulation in Stata?
• FAQ: How can I anonymize patient IDs and still be able to decode them, if necessary?

R

• DAE: Interval Regression Includes 3d animated predicted regression surface.

What's New in August, 2012

R

• Data Analysis Example: Zero-truncated Poisson Regression
• Data Analysis Example: Zero-truncated Negative Binomial Regression
• Data Analysis Example: Truncated Regression

SAS

• Code Fragment: Reading and Analyzing the Hospital Doctor Patient Dataset

SPSS

• Code Fragment: Reading and Analyzing the Hospital Doctor Patient Dataset

Stata

• FAQ: Why doesn't the test of the overall survey regression model in Stata match the results from SAS and SUDAAN?
• Code Fragment: Reading and Analyzing the Hospital Doctor Patient Dataset
• Code Fragment: Compute Adjusted Values from Cox Model using Mata
• Code Fragment: Generate Anonymous Keys using Mata

Mplus

• DAE: Zero-inflated negative binomial regression
• DAE: Zero-truncated negative binomial regression

What's New in July, 2012

R

• R Data Analysis Examples: (Approximate) Exact Logistic Regression
• FAQ: How can I visualize longitudinal data in ggplot2?
• FAQ: How can I make individual growth curves in ggplot2?
• FAQ: How can I explore different smooths in ggplot2?

Stata

• FAQ: How can I get margins for a multiply imputed survey logit model? (Stata 12)
• FAQ: Sample setups for commonly used survey data sets 

What's New in June, 2012

R

• Random coefficient poisson models
• Multivariate random coefficient model
• How can I perform mediation with multilevel data? (Method 2)
• R Advanced: Simulating the Hospital Doctor Patient Dataset

Stata

• Stata Code Fragment: Compute Dispersion using Mata (Stata 12)

SAS

• Zero Truncated Poisson Regression
• Zero Truncated Negative Binomial Regression

What's New in May, 2012

Stata

• FAQ: How can I compare indirect effects in a multiple group model? (Stata 12)

What's New in April, 2012

SPSS

• DAE Page: Multinomial Logistic Regression
• DAE Page: Ordinal Logistic Regression
• FAQ: How can I perform mediation with multilevel data? (Method 2)

SAS

• FAQ: How can I perform mediation with multilevel data? (Method 2)
• FAQ: How do I run a random effect tobit model using nlmixed?
• FAQ: How do I run a random effect zero-inflated poisson model using nlmixed?

Stata

• Compute SRMR from SEM using Mata
• Computing the Sum Difference Between Two Lattitude and Longitude Points using Mata

What's New in March, 2012

Stata

• FAQ: How can I get margins and marginsplot on multiply imputated data? (Stata 12)
• FAQ: How can I understand a categorical by continuous interaction in ologit? (Stata 12)

What's New in February, 2012

Stata

• FAQ: How can I estimate probabilities that include the random effects in xtmelogit? (revised)

What's New in January, 2012

Stata

• FAQ: Everything you always wanted to know about contrasts* (*But were afraid to ask)