[R] How to apply the Wilcoxon test to a hole table at once?
Iurie Malai
iurie.malai at gmail.com
Sat Oct 24 07:23:15 CEST 2009
Thank you!
Here is my adapted script:
>lapply(Dataset[3:17], function(x) wilcox.test(x ~ X2,
alternative="two.sided", data=Dataset, subset = X2 <= 2))
but in R I have nothing, and in R Commander I have this error message:
ERROR: grouping factor must have exactly 2 levels
My grouping factor is in X2 column and there are only two levels (m and f).
Where is the problem?
Iu. Malai
Iurie Malai wrote:
>
> Hi,
>
> I have a data set:
>
>> Dataset
> X1 X2 X3 X4 X5 X6 X7 X8 X9 X10 X11 X12 X13 X14 X15 X16 X17
> 1 user1 m 22 19 28 24 12 18 9 7 4 5 4 7 5 7 9
> 2 user2 f 25 19 23 18 18 15 6 8 6 6 7 10 7 7 7
> 3 user3 f 28 21 24 18 15 12 10 6 7 9 5 10 5 9 5
> 4 user4 f 26 19 26 21 12 18 6 6 5 1 3 8 6 5 6
> 5 user5 m 21 22 26 18 9 6 4 6 1 7 2 4 4 6 4
> 6 user6 m 24 8 25 12 18 12 7 8 4 1 4 6 7 5 6
> ...............................................................
> 71 user71 m 18 4 10 6 3 6 9 5 10 8 4 5 6 5 5
>
> I can apply the Wilcoxon test on each column one by one, but how to do
> this on the hole table at once?
>
>> wilcox.test(X3 ~ X2, alternative="two.sided", data=Dataset)
>
> Wilcoxon rank sum test with continuity correction
>
> data: X3 by X2
> W = 439, p-value = 0.1291
> alternative hypothesis: true location shift is not equal to 0
>
>>
>
> I researched on this, but I can't find a solution.
> I would really appreciate any help.
>
> P.S. Excuse my lack of terminology :).
>
> Iurie Malai
> Moldova Pedagogical State University
>
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