Hi ballardw, Thanks a lot. I tried 2 data sets with 10,000,000 obs and 1,000,000 with the same proc means setting. The median value of data set with 10,000,000 obs varies from time to time But, for the data set with less obs (1,000,000), the median value is fixed. The code is shown below. Please help to take a look. Thank you. For the data set example with 10,000,000 obs, each time I run the proc means with qmethod = P2, the median values varies. But for the data set example2, the median value is fixed value whenever I run the proc means with qmethod = P2. data example; do i= 1 to 10000000; output; end; run; proc means data=example qmethod=p2 median; title 'Without Qmarkers'; var i; run; title; data example2; do i= 1 to 1000000; output; end; run; proc means data=example2 qmethod=p2 median; title 'Without Qmarkers'; var i; run; title;
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