Dear all,

I have pooled cross-sectional data for 4 years. Some individuals are only in one year, but some are in 2, 3 or 4 years. I control for time effects, i.e. I use dummy variable to control for years. Every time I run probit model I get slightly different results, e.g. estimated coefficients are ones 0.143, second time 0.150, third time 0.148, etc. I already read that it is problem of sorting variables that are not uniquly identified. My question is how should I sort variables in order to get same results each time. I tried the following twp sorting, but it does not work? I am not interested in panel data analysis, I want to do basic probit analysis.

sort idperson year

sort year idperson

Also, my dependent variable is employed/not employed and explanatory variables are education, age, marital status, children, etc.

Thank you.

Best,

Aleksandra

I have pooled cross-sectional data for 4 years. Some individuals are only in one year, but some are in 2, 3 or 4 years. I control for time effects, i.e. I use dummy variable to control for years. Every time I run probit model I get slightly different results, e.g. estimated coefficients are ones 0.143, second time 0.150, third time 0.148, etc. I already read that it is problem of sorting variables that are not uniquly identified. My question is how should I sort variables in order to get same results each time. I tried the following twp sorting, but it does not work? I am not interested in panel data analysis, I want to do basic probit analysis.

sort idperson year

sort year idperson

Also, my dependent variable is employed/not employed and explanatory variables are education, age, marital status, children, etc.

Thank you.

Best,

Aleksandra

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