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...lm(mod, hyp.matrix, SSPE = SSPE, idata = idata, : The error SSP matrix is apparently of deficient rank = 4 < 6 Thanks for any help or advice. And thanks for the 'car' package, which is a great asset to my course. I'm just stuck on this one example. colleen moore http://www.childrenandpollution.org/ChildrenPollution/ChildrenAndPollution/more_info.html Colleen F. Moore, Professor Psychology Department 1202 W. Johnson St. University of Wisconsin Madison, WI 53706 cfmoore@wisc.edu ----- [[alternative HTML version deleted]]