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st: Re: FW: Code erroring out because of "no observations"


From   "Ariel Linden, DrPH" <ariel.linden@gmail.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Re: FW: Code erroring out because of "no observations"
Date   Fri, 26 Jun 2009 10:42:33 -0700

I would like to thank Howie Lempel, Martin Weiss and Scott Merryman for
their responses to my question. My code runs like a charm using any of the
three methods proposed!

Date: Thu, 25 Jun 2009 16:44:26 -0400
From: Howard Lempel <HLempel@brookings.edu>
Subject: st: RE: Code erroring out because of  "no observations"

Hi Ariel,

In your loop, _N represents the number of total observations, not the total
number of waves.  There are only 15 waves of data, so when i gets to 16, you
get an error - there are no observations for which wave==16.  

I think you want to change your loop to the following:

forvalues i=2/15 {
logit  union  l.ln_wage l.age l.collgrad l.tenure l.hours if wave==`i'
predict pred`i' if wave == `i'
}

If you don't want to stick 15 in as a magic number, you could to the
following:

sum wave
local max = r(max)
forvalues i=2/`max' {
logit  union  l.ln_wage l.age l.collgrad l.tenure l.hours if wave==`i'
predict pred`i' if wave == `i'
}

Hope this helps.
Howie

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