[R] Wilcoxon V = 0

[David L Carlson]

It all depends on which order you put the values. Try this

wilcox.test(x=b$x,y=a$x,paired=TRUE)

Either one is an extreme. A non significant value would be in the middle. 


----------------------------------------------
David L Carlson
Associate Professor of Anthropology
Texas A&M University
College Station, TX 77843-4352


> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Naomikb
> Sent: Tuesday, July 24, 2012 4:36 PM
> To: r-help at r-project.org
> Subject: [R] Wilcoxon V = 0
> 
> I am running a pairwise wilcoxon signed rank test, and I am not sure
> how to
> interpret the result.  I would like to see if there is a difference
> between
> the values in conditions a and b. It doesn't seem possible to have a V
> = 0,
> but a significant p value. Am I doing something wrong?
> 
> The command I used is this:
>  wilcox.test(x=a$x,y=b$x,paired=TRUE)
> 
> 
> The output looks like this:
> 	Wilcoxon signed rank test
> 
> data:  a$x and b$x
> V = 0, p-value = 0.0009766
> alternative hypothesis: true location shift is not equal to 0
> 
> The raw data is here:
> 
> a
>    participant        condition            x
> 34           1 fused.mu.control           315.5677
> 35           2 fused.mu.control           516.8781
> 36           3 fused.mu.control           362.8108
> 37           4 fused.mu.control           482.6022
> 38           5 fused.mu.control           423.6593
> 39           6 fused.mu.control           404.9358
> 40           8 fused.mu.control           342.7314
> 41           9 fused.mu.control           466.7561
> 42          10 fused.mu.control           467.5002
> 43          11 fused.mu.control           434.0221
> 44          12 fused.mu.control           480.2990
> 
> 
> b
>    participant   condition      x
> 45           1 fused.multi           373.0648
> 46           2 fused.multi           517.5159
> 47           3 fused.multi           390.2658
> 48           4 fused.multi           497.2303
> 49           5 fused.multi           519.7867
> 50           6 fused.multi           499.7950
> 51           8 fused.multi           345.8077
> 52           9 fused.multi           479.1607
> 53          10 fused.multi           539.5856
> 54          11 fused.multi           446.9569
> 55          12 fused.multi           569.5171
> 
> 
> 
> 
> --
> View this message in context: http://r.789695.n4.nabble.com/Wilcoxon-V-
> 0-tp4637675.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.