[R] Wilcoxon V = 0

[Naomikb]

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




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