Deleting variables

[Justin Fiedler]

Dear all,

please help me with the following.

I have a dataset with the variables hhid and age
i want to drop a observation if (the value of hhid is the same for two or more observations and the value of age is lower then the other values with the same hhid)

thanks a lot

[Nick Cox]

Deleting variables != dropping observations but it seems that you want

bysort hhid (age) : keep if _n == _N

but watch out if you have missing values on age.