st: modifying egen to add a replace feature

[Pradipto Banerjee <pradipto.banerjee@adainvestments.com>]

There are many times, I want to modify a macro as follows:

bysort x: egen ytemp = myfunc (y, a, b, ...)
replace y = ytemp
drop ytemp

Is it possible to rewrite or modify egen, or create an ado file, such that I can simply write like this:

bysort x: egen y = myfunc (y, a, b, ...), replace



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