"Simon Blomberg" <[EMAIL PROTECTED]> writes: > Hi all, > > I have received the following error from summary.manova: > > Error in summary.manova(manova.test, test = "Pillai") : > residuals have rank 36 < 64 > > The data is simulated data for 64 variables. The design is a 2*2 > factorial with 10 replicates per treatment. Looking at the code for > summary.manova, the error involves a problem with qr(). Does anyone > have a suggestion as to how to deal with this error? The analysis > works fine when there are only 32 variables.
So were you expecting "residuals have rank 36 < 32" in that case?? Some multivariate tests require that you can obtain a full rank estimate of the covariance matrix, which requires the residual degrees of freedom to be less than the number of response variables. Not sure whether there is a meaningful way to proceed if that is not the case - I suspect you'll get negative DF for the F tests and similar awkwardness. -- O__ ---- Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
