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Dear list, Just wanted to confirm that I got the GLM right. I got 3 groups of subjects: low-risk, high-risk & affected. The participants are twins, most but not all have both twins present. The twin pairs can be in the same group i.e. the low-risk group, but can also be split between the high-risk and affected groups. I have 3 EVs for the three groups and in order to account for within-pair variance correlation I have an extra EV for each twin pair with two 1s for the respective twins pair and 0 otherwise. Would this be an accurate GLM setup? Cheers, Julian ######################################################################## To unsubscribe from the FSL list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=FSL&A=1