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I am calculating the covariance between two measurements predicted
after a model fitting. This covariance involves some matrix operations
of the covariates matrix. That's why I need the matrix.
You can perform those operations on matrix X within Mata, per my prior
message.
Kit Baum | Boston College Economics & DIW Berlin | http://ideas.repec.org/e/pba1.html
An Introduction to Stata Programming
| http://www.stata-press.com/books/isp.html
An Introduction to Modern Econometrics Using Stata | http://www.stata-press.com/books/imeus.html
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