st: some feature requests

[David Airey <david.airey@Vanderbilt.Edu>]

I was just thinking about Stata 10.1 versus when I started using it  
(v7). It is a much better environment now. What's missing for me?

Maybe nonlinear mixed models. Sometimes in pharmacology or genetics we  
have nonlinear curves and hierarchical data sets.

Maybe some more covariance patterns in linear mixed models. Toeplitz  
has been used in some of our genetics applications.

Also some of the chapters in West, Welch, and Galecki "Linear Mixed  
Models" did not have complete models for Stata because of a lack of  
features (e.g., allowing residual variances to vary between different  
levels of a group variable).

I still on occasion use a rotating plot in another package (R, JMP or  
Data Desk).

Maybe a book on linear algebra for statistics using Mata. I had  
thought about translating Searle's text, but have no time.
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