hi all groups

in calculate correlation ,i received this message:

> cor.test(depth,abundance,method="spearman")

        Spearman's rank correlation rho

data:  depth and abundance

S = 76554.61, p-value = 0.03969

alternative hypothesis: true rho is not equal to 0

sample estimates:

      rho

0.2249205

>Warning message:

In cor.test.default(depth, abundance, method = "spearman") :

  Cannot compute exact p-values with ties


what is exactly means ( Cannot compute exact p-values with ties)?


thanks
-- 
Mahnaz

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