How do I do a one-tailed ranksum test?

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Hi!
I was wondering how to use the Ranksum function in the Statistics Toolbox with a one-sided tail.  I know that the p-value is calculated for a 2 sided tail.  Can I halve the p-value for a one-sided test if I know that the median of one group of inputs is larger than the other (and I am testing to see whether the values in this group are statistically greater than the one with the smaller median)?

Thanks
Krithiga
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Reply Krithiga 8/26/2010 4:26:05 PM


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