[R] Wilcoxon Rank Sum Test.

From: Marcus Vinicius <mvinic_at_gmail.com>
Date: Thu, 28 Jun 2007 17:31:49 -0300


Dear,

I'm using R software to evaluate Wilcoxon Rank Sum Test and I' getting one Warning message as this:

> C1dea_com

 [1] 1.000 0.345 0.200 0.208 0.508 0.480 0.545 0.563 0.451 0.683 0.380 0.913 1.000 0.506
> C1dea_sem

 [1] 1.000 0.665 0.284 0.394 0.509 0.721 0.545 0.898 0.744 0.683 0.382 0.913 1.000 0.970

> wilcox.test(C1dea_sem,C1dea_com, paired = TRUE, alternative = "two.sided")

        Wilcoxon signed rank test with continuity correction

data: C1dea_sem and C1dea_com
V = 45, p-value = 0.009152
alternative hypothesis: true mu is not equal to 0

Warning message:
Cannot compute exact p-value with zeroes in: wilcox.test.default(C1dea_sem, C1dea_com, paired = TRUE, alternative = "two.sided")

What is happening?

Best Regards,

Marcus Vinicius

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