Since SAS/IML 9.22, IML has supported a VAR function, which computes the variance of each column of a matrix. Use SQRT(VAR(X)) to get the standard deviation.
For how to compute the variance of each column prior to SAS/IML 9.22, see my blog post on "Computing the Variance of Each Column of a Matrix".
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Learn the difference between classical and Bayesian statistical approaches and see a few PROC examples to perform Bayesian analysis in this video.
Find more tutorials on the SAS Users YouTube channel.