[R] wilcox.test and ties

Swanepoel, Christiaan Edward christiaan.edward.swanepoel at sap.com
Fri Jul 19 15:16:58 CEST 2002


when performing the wilcox.test on a sample (n=100) with the following frequency distribution:
Value	|	Frequency
0	|	10
0.1	|	88
1	|	1
2.6	|	1

I get the following error message:

Error in uniroot(wdiff, c(mumin, mumax), tol = 1e-04, zq = qnorm(alpha/2,  : 
	f() values at end points not of opposite sign

The error only occurs when I specify that the confidence interval should be computed.

Could anybody suggest how I can compute the confidence interval for this sample? Is the problem connected with the large number of ties and if so, how can I handle these ties?

Thanks in advance.


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