Thomas de Hoop wrote:
Dear Statalist users,
I have created dummy variables for 214 countries. For each of these
countries I want to estimate several logit models to estimate chances
of certain situations to occur, and create chance variables from the
prediction of these models. I estimate these chances using data from
the past. I have data of these situation For this I created loops with
the foreach and forvalue commands from stata. The problem is that in
some countries a certain situation never occurred. For these
situations there are only 0 value observations. Of course logistic
regression is not possible in these kind of situations. For this
reason I would like to skip these equations in the loop.
For this reason I counted the number of times a situation did occur in
the past and created a variable.
I tried to skip the equation as follows:
forval i=1/214 {
logit drought`i' variable1 variable 2 etc. if droughtcount`i'>0
}
i= the country number
variable1 variable2 etc are the explanatory variables.
drought`i'=the situation in a certain country
droughtcount`i'=the number of times a situation did occur in the past.
For country 3 this results in the following error:
no observations
r(2000);
I add some more information that might be useful. Country 3 is a country
where the situation never occurred.
How can I prevent this error?
Best regards,
Thomas de Hoop
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