wilcox.test statistics

-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch 
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Liu Ting-Yuan
Sent: Wednesday, March 02, 2005 12:15 PM
To: r-help at stat.math.ethz.ch
Subject: [R] wilcox.test statistics


Hi,

Could anyone provide the formula of the statistics which the 
wilcox.test 
used for the two-sample rank-sum test?  I got some statistics 
of 0 values, 
but it is impossible to have 0 "rank-sum".  Does the function use the 
Mann-Whitney U test statistics?  Thanks.

Ting-Yuan Liu