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Ah! This shows my ignorance of statistics. It was a failure (on my part) to properly understand the terminology - the standard deviation of the parameter estimate is the same thing as the standard error of the mean! Thank you, and enjoy your holiday! Allison Nugent MRI Physicist SNMAD/MIB/NIMH/NIH Office: (301)451-8863 Mobile: (301)408-8560 [log in to unmask] > StandardDeviation_of_BetaA = sqrt(Pooled_Variance/N_groupA) But, the important thing to note is that beta is the sample mean. The standard deviation of the mean *is* the standard error --- it's just terminology that people say "standard error" for the standard deviation *of a parameter* --- no further division by sqrt(N) is required. That is, the GLM maths is giving you the parameter estimates beta, and the standard deviations of these estimates, which you could call standard errors.