On Mar 1, 2010, at 12:12 PM, Amit Patel wrote:
Apparently the vectors that I have are lists
Then unlist them.
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
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