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st: re: matrix command: vecdiag?


From   Kit Baum <baum@bc.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: re: matrix command: vecdiag?
Date   Sun, 2 Sep 2007 21:39:15 -0400

Tiago's problem is that he wants to read a lot of separate data files, compute some summary statistics from each one and assemble them. He wanted to use a Stata matrix. It is much easier to use a new Stata dataset. Take auto.dta and save 5 files, each one containing the observations for rep78==1,2,3,4,5. Then

postfile ppp mu sigma str20 fn using summfile, replace
forv i=1/5 {
use rep`i',clear
qui sum price
local fn rep`i'.dta
post ppp (r(mean)) (r(sd)) ("`fn'")
}
postclose ppp
use summfile
desc
lesc
l

will produce a new Stata dataset with the desired contents: mean, std.dev. and the name of the file from which they were computed.

Kit

Kit Baum, Boston College Economics and DIW Berlin
http://ideas.repec.org/e/pba1.html
An Introduction to Modern Econometrics Using Stata:
http://www.stata-press.com/books/imeus.html


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