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st: Mata query
Ade wonders what
select(0,1) versus select(0,0) does.
a = select(0,1)
b = select(0,0)
and you will see that the first returns a scalar, whilst the second
returns a matrix b[0,0]. I believe that is what is known as a void
matrix. Examining the help for void matrices might be useful. Also
compare to standard Stata function nullmat().
Kit Baum, Boston College Economics and DIW Berlin
An Introduction to Modern Econometrics Using Stata:
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