Make a variable based on a pattern for sas dataset -


i made dataset random numbers outcome , observation. want every other value 0 , other 1 i'm unsure how proceed. there way can tell sas either pattern or give evens value or something?

 id      outcome     trt  1         1          0  2         1          1  3         0          0   4        1          1

etc. looked @ maybe using mod understand take values out of dataset not create information treatment.

mod function. functions have arguments, , return value. mod work you. n automatic variable counts how many times data step has iterated. try:

data want ;   set have ;   trt = mod(_n_,2) ; run ;

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