Thanks for replying. Not sure why using "sixth of the range as the standard deviation". In addition, I am trying the similar: data symm(keep=y); %let data symm(keep=y); %let st=0.0012; seed = 11907665 ; do i = 1 to 8; y = rand("Normal", 0.19,&st ); if 0.26>=y>=0.13 then output; end; run; ; seed = 11907665 ; do i = 1 to 8; y = rand("Normal", 0.19,&st ); if 0.26>=y>=0.13 then output; end; run; I will try st=1/6(max-min), 1/4........1/8 until the output in 0.26>=y>=0.13 that range. Is that make sense
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