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st: Re: re: counter variable
<>
You have to hand it to all contributors here, though, that this is not your
everyday, apply-bysort-straightforwardly-and-look-at-Nick`s-column-
in -the-SJ-carefully problem (see
http://www.stata-journal.com/sjpdf.html?articlenum=pr0004). The fact that
you want this thing sorted, but not counted, by schoolyear and counted, but
not sorted, by the new dummy, makes this quite involved, and despite my best
effort, I cannot find a one liner for it that does not make extensive use
of -cond-. So kudos to Eva for her two liner :-)
HTH
Martin
_______________________
----- Original Message -----
From: "Kit Baum" <[email protected]>
To: <[email protected]>
Sent: Saturday, May 02, 2009 4:49 PM
Subject: st: re: counter variable
<> T suggested
g newvar = 1 if new_prc==1
bys Id (schlyr): replace newvar = newvar[_n-1]+1 if newvar !=1
This sounds to me like a generally bad idea. The first statement just
changes the new_prc zero values into missing values. The second statement
relies upon the fact that missing is a value not equal to 1. Although the
logic works, I think Eva's suggested approach is a better way to think
about a problem like this (although I deplore her reliance on -set
varabbrev on-, which is IMHO a Very Bad Idea).
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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