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Re: st: storing values from within "by varname :" command

From   "David Elliott" <>
Subject   Re: st: storing values from within "by varname :" command
Date   Sun, 22 Oct 2006 11:19:43 -0300


Unless the command you are iterating for the by variables allows some
way to save values, or if you actually add that feature to the ado you
are calling, I don't believe what you want is possible within the
context of the by command.

There is an alternative, however:

// This assumes variables region and group are numeric
// If they are strings the commands postfile and post and the ifcmd must
// be altered accordingly

tempname h
postfile `h' region_level group_level count using mycounts, replace

levelsof region, local(l_region)
levelsof group, local(l_group)

foreach region_level of local l_region {
	foreach group_level of local l_group {
		count if region==`region_level' & group==`group_level'
		// count is returned in r(N) so
		local count=`r(N)'
		post `h' (`region_level') (`group_level') (`count')

postclose `h'
use mycounts, clear


With a little work, this could be adoed to accept a more general case
of passthru commands and capture the postfile output, even
transferring variable and value labels to the new file.

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