I have 25 observations i want to assign 1 to a variable for 1 - 12 observations and assign 2 to the same variable for 13-25 observations
by order or randomly?
If you mean by order, the first 12 records are to be one then:
data want; set have; if _n_ le 12 then variable=1; else variable=2; run;
_n_ is a SAS automatic variable that counts iterations of a data step. In a simple use like this it is basically the row number.
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