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st: Code erroring out because of "no observations"

From   Marcello Pagano <>
Subject   st: Code erroring out because of "no observations"
Date   Thu, 25 Jun 2009 16:28:45 -0400

From: Ariel Linden, DrPH [] Sent: Wednesday, June 24, 2009 2:40 PM
To: ''
Subject: Code erroring out because of "no observations"

Hi All,

I am running some code in the nlswork file in which I use lagged values in the present period’s logit model. Since there are individuals in the file that don’t have more than one period (wave), the code errors with “no observations.”  As a result, the code cannot continue to the last line I have below which generates a variable with the max of all the waves.

I tried using “capture” but the loop never ends.
I’d appreciate it if someone could tell me how to override the error and continue on to the next line of code? (if my poor coding could be improved as well, I’d appreciate that as well) ☺

Thanks in advance


***** start of code**********
webuse nlswork, clear

sort idcode year
bysort idcode: egen wave = seq()

tsset idcode wave

logit union age collgrad tenure hours if wave==1

predict pred1 if e(sample)

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

egen predfinal = rowmax( pred*)

***** end of code*************

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