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st: re: output from mata:variance
From
Kit Baum <[email protected]>
To
[email protected]
Subject
st: re: output from mata:variance
Date
Sat, 6 Mar 2010 14:42:14 -0500
<>
No need for all this code:
//get this result w/o -mata-
preserve
stack mpg length , into(newvar) clear
su n, d
local varmpglength=r(Var)
restore
di `varmpglength'
with Mata, all you need is
sysuse auto, clear
mata:st_numscalar("vv",variance(vec(st_data(.,("mpg","length")))))
di vv
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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