st: multiple observations

[Diddy Antai <diddy.antai@ki.se>]

Hello,
     Could you help me with the command that creates a new 
variable "newid" that is 1 for the last observation for each 
individual and missing otherwise. 

I have a dataset with multiple observations (mothers), and I want to 
create a variable with each mother appearing once irrespective of the 
number of children she has.
Thank you

D

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