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...and call this a group variance, but it seems to me that isn't the right way to think about it. I'm trying to calculate a heritability value for a trait in an organism, defined as Vg/Vp, where Vg = variance due to genotype and Vp = total variance. The model is p~g, or p[i,j] = intercept + g_coefficient[i] + error[i,j]. But to get Vg, I think it is actually necessary to use a different model, where g is modelled as a random variable (a random effect), so the model can estimate a variance associated with it. If anyone can add something to this, please do. ted -- View this message in contex...