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 d?faut when i checked the help i have understood that in g i should specified my diff?rent 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. -- View this message in context: http://www.nabble.com/bartlett.test%28%29-tp17665173p17665173.html Sent from the R help mailing list archive at Nabble.com.
I think you should specify your grouping factor: g a vector or factor object giving the group for the corresponding elements of x. Ignored if x is a list. batlett.test(xx, groupingfactor) Hope this helps. Birgit 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 d?faut > > when i checked the help i have understood that in g i should specified my > diff?rent 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.
>>> Birgitle <birgit.lemcke at systbot.uzh.ch> 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 d?faut > > when i checked the help i have understood that in g i should specified my > diff?rent 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 at 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}}