[R] What are ties? Wilcox u-test

From: Dirkheld <dirk.bollen_at_soc.kuleuven.be>
Date: Wed, 30 Apr 2008 00:31:10 -0700 (PDT)


When I execute a Wilcox u-test on two variables I receive a warning : 'cannot compute exact p-value with ties'
- What are ties? What does this mean for my data?

I have different threads in this forum but it hard to find what the exact meaning of this warning message is.

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