<>
Just try it out by introducing missings into a panel
*************
webuse union, clear
probit union age grade not_smsa south southXt
loc full `e(N)'
foreach var of varlist age grade not_smsa south southXt{
replace `var'=. if runiform()<0.02
}
probit union age grade not_smsa south southXt
di in red "Decline from " `full' " to " `e(N)' " due to missings"
*************
HTH
Martin
-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von SMAC
Gesendet: Donnerstag, 5. März 2009 14:51
An: [email protected]
Betreff: st: Nº of Observations in Probit regressions
Dear Statalisters,
I have a little doubt about the probit's output "Nº Obs." what does it
means exactly?
I have an unbalanced panel with 5120 obs. (8 years x 640 firms in
average), but when I run a probit regression (with probit command, not
xtprobit)
the Nº obs specified in the output is 2225. What happens with the rest
of observations? are they dropped due to missing values in independent
variables?
Dependent Variable has not missing values, but among independents
variables, there is several variables with missing data.
I would really appreciate your help,
Sergio
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