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Hi,

How to select every second observation value (starting from the second observation) from the sample to be included in the equation estimation?

I know that @first+1 excludes first value but I don't know how then to include every second value till the last one.

Thanks.

Look carefully at the variables in your data set. Hint: what makes the second observation in each pair different from the first?

Are you reffering to the even value of observation id? If yes, it occurred to me but don't know how to code it.

I think if you look at all the variables, you will find that one contains the year of the observation or is a dummy for the year. You can then use smpl if to only include those observations that you want.

Yeah, it worked. I entered "smpl 1 92 if year = 87"; the sample size (46) and coefficients now correspond.

Thanks. :D