We can observe male and female. We can't observe risk loving and risk averse. But fmm can tease that distinction out of your data.

Drug absorption rates, growth curves, decay ... You have a nonlinear model. You have within-subject correlation. You need menl. Stata 15 has it.

Reese's Pieces > Butterfinger?
Kit Kat > Starburst?

Walt Hickey knows, and he's got the research to prove it.

Want to import data from Twitter into Stata? Our intern, Dawson Deere, made this possible.

Authors Steven G. Heeringa, Brady T. West, and Patricia A. Berglund teach you how to analyze complex survey data. And how to do it in Stata.

Join us from anywhere for tours of new features in Stata 15. Direct to you from the experts who wrote the commands.