>>> Birgitle <[EMAIL PROTECTED]> 05/06/2008 10:33:20 >>> >I think you should specify your grouping factor: Yes, the message says the grouping factor is missing.
But xx should not be a matrix. Your x data should be in a (1-dimensional) vector of length 276, and so should your grouping factor. Toy example: x<-rnorm(9) g<-factor(paste("Group",rep(1:3, each=3))) bartlett.test(x,g) hanen wrote: > > i'm trying to test the homogeneity of variance of 92 samples each one > contains 3 observations. > to use bartlett.test function i have created a (3,92) matrix (named xx): >>bartlett.test(xx) > > this message appears: > >>Erreur dans bartlett.test.default(xx) : > l'argument "g" est manquant, avec aucune valeur par défaut > > when i checked the help i have understood that in g i should specified my > différent samples in the case that xx is not a list.So i have tried to > convert mode's xx in the list by: > >>bartlett.test(list(xx)) > > this message appears: > >>Erreur dans bartlett.test.default(list(xx)) : > 'x' must be a list with at least 2 elements > > what should i do? > and if the solution is to use a data frame how can i add the 92 > columns'names to such data.frame? because the use of the function > names(data.frame)<-list("... and entering 92 words it seems painfull. > > is there any one who can help me now? > > please answer me as soon as possible. > > ----- The art of living is more like wrestling than dancing. (Marcus Aurelius) -- View this message in context: http://www.nabble.com/bartlett.test%28%29-tp17665173p17665913.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. ******************************************************************* This email and any attachments are confidential. Any use...{{dropped:8}} ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.