[R] wilcox.test returned estimates

From: <pmt1rew_at_leeds.ac.uk>
Date: Wed 15 Feb 2006 - 22:36:35 EST


Hi all,

I have being using wilcox.test to test for differences between 2 independent samples. I had understood the difference in location to be conventionally the difference in the sample medians however this is not the case when implemented in R. I have tied ranks and therefore non-exact p-value and confidence intervals are calculated due to the normal approximation. But what exactly is this normal approximation i.e. how is it involved in estimating the location difference?

Further, is it then wrong to refer to the difference in location as the difference between the medians? Does anyone have a more appropriate description?

Thanks

Rebecca



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