Apparently the vectors that I have are lists and when I try to conduct the Bartlett test I am getting errors. I may be using it wrong. I am not an R expert>
xbartlett2 <- c(Samp1,Samp2) #Samp1 & 2 are lists gbartlett24 <- c(1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2) Attempt 1 > gazant <- bartlett.test(xbartlett2~gbartlett24)$p.value Error in model.frame.default(formula = xbartlett2 ~ gbartlett24) : invalid type (list) for variable 'xbartlett2' xbartlett2 <- c(Samp1,Samp2) > gazant <- bartlett.test(xbartlett2, gbartlett24)$p.value Error in bartlett.test.default(xbartlett2, gbartlett24) : there must be at least 2 observations in each group (There are at least 2 unique observations in each group) Thanks in advance ----- Original Message ---- From: "Richardson, Patrick" <patrick.richard...@vai.org> To: Amit Patel <amitrh...@yahoo.co.uk>; "r-help@r-project.org" <r-help@r-project.org> Sent: Mon, 1 March, 2010 14:31:15 Subject: RE: [R] Bartlett Test ?bartlett.test >From the help page "If x is a list, its elements are taken as the samples or >fitted linear models to be compared for homogeneity of variances. In this >case, the elements must either all be numeric data vectors or fitted linear >model objects, g is ignored, and one can simply use bartlett.test(x) to >perform the test. If the samples are not yet contained in a list, use >bartlett.test(list(x, ...)). Otherwise, x must be a numeric data vector, and g must be a vector or factor object of the same length as x giving the group for the corresponding elements of x. " Patrick -----Original Message----- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of Amit Patel Sent: Monday, March 01, 2010 9:26 AM To: r-help@r-project.org Subject: [R] Bartlett Test Hi I am trying to conduct a Bartlett test between two groups Samp 1 and Samp 2, both of which are vectors of equal length. I cant find any information on how to do this. Does the data need to be in a structured list. Thanks in advance ______________________________________________ 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. The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer. ______________________________________________ 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.
