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...(c3) = 0. I could accomplish this by writing code to suitably shift the coefficients after performing the basic regression above, but I'm hoping there's a better way. Is there? thanks, Rnewb -- View this message in context: http://www.nabble.com/linear-model-with-coefficient-constraints-tp25769020p25769020.html Sent from the R help mailing list archive at Nabble.com.