What's New in April, 2009?

SAS

• Code fragment: Random effect Tobit model in nlmixed
• FAQ: How can I bootstrap estimates in SAS?

Stata

• FAQ: How can I understand a categorical-by-categorical interaction in logistic regression?
• FAQ: How can I understand a categorical-by-continuous interaction in logistic regression?
• FAQ: How can I read binary data in Stata?

SPSS

• FAQ: How can I perform hypothesis tests in glm?
• Library: Inputting and manipulating dates in SPSS?