Reading the posting guide will tell you (among other things) to :
a) use a sensible subject line
b) give a reproducible example when possible
See other comments below.
On Wed, 2004-11-03 at 19:04, fang lai wrote:
> Hi there,
> When I ran the wilcox.exact test, it always shows
> "number of items to replace is not a multiple of
> replacement length"
> However, according to the help it seems to be able to
> handle sample of different size.
I think the error refers to incorrect lengths during assignment. See
example below.
> aaa <- matrix( 1:4, nr=2 )
> aaa
[,1] [,2]
[1,] 1 3
[2,] 2 4
> aaa[1, ]
[1] 1 3
> aaa[1, ] <- 1:3
Error in "[<-"(`*tmp*`, 1, , value = 1:3) :
number of items to replace is not a multiple of replacement length
Or you might be trying something like
> aaa <- matrix( 1:4, nr=2 )
> aaa[1, ] <- wilcox.test( 1:3, 1:10 )
Error in "[<-"(`*tmp*`, 1, , value = wilcox.test(1:3, 1:10)) :
number of items to replace is not a multiple of replacement length
Wilcoxon and all other two-group test statistics (when pairing is not
involved) can handle groups of different size.
Try wilcox.test( 1:3, 1:10 ).
To extract p-value only, do wilcox.test( 1:3, 1:10 )$p.value
> What does this message indicate, and will it cause a
> problem of the resulting p-value?
Not directly. You could be expecting p-values to be in, say the 5th
column, but it might be stored elsewhere. But in your case I think the
results will not be stored anyway.
> Also, when I run the ks.test(), it shows sometimes
> that
> cannot compute correct p-values with ties in:
> ks.test(income.perm[(data[, 3] == 59) & (data[, 2] ==
> 1)], income.perm[(data[, ...
Is this a warning or an error ? There is a distinction.
> And sometime it shows results and sometimes it just
> return NULL. When it shows the results, does it mean
> that it had some kind of continuity correction or
> other adjustment so that I could believe the results?
> Many thanks,
>
> Fang
>
>
> =====
> Lai, Fang
>
> PhD candidate
> University of California, Berkeley
> Department of Agricultural and Resource Economics
> 314 Giannini Hall, Berkeley, CA 94720-3310
> tel: (510) 643 - 5421(O)
> (510) 847 - 9811(Cell)
> fax: (510) 643 - 8911
> email: [EMAIL PROTECTED]
> http://www.are.berkeley.edu/jobmarket/fang.html
>
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