Hi all
am just investigating the finer details of the Mann Whitney test and
trying to calculate confidence intervals for the porder statistic. I
have the following dummy data with var2 as the grouping variable
using STATA's ranksum with porder option gives me a value of 0.594
(for group = 0 over group = 1). Doing the same calculation using the
somersd package with transf(c) option gives me a confidence interval.
( I used vreverse to generate rgroup)
| Jackknife
rgroup | Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
var1 | .59375 .1594069 3.72 0.000 .2813182 .9061818
-----------------------------------------------------------------------------
but with a p value that seems rather low and doesn't seem to make
sense with the confidence interval, since I would have thought the
null of probability/proportion would be 0.5
Any thoughts?
thanks
Andy
var1 var2
1 0
5 0
9 0
14 0
21 0
29 0
39 0
49 0
3 1
4.5 1
7 1
12 1
19 1
20.5 1
26 1
30 1
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