Re: [R] Wilcoxon rank sum in unbalanced design

From: peter dalgaard <pdalgd_at_gmail.com>
Date: Wed, 13 Apr 2011 20:45:27 +0200

On Apr 13, 2011, at 17:07 , netrunner wrote:

> Hi everyone!
> I need to perform a Wilcoxon rank sum test, but I have some ties and the
> groups have different size also. When I deal with ties I use the
> wilcox.exact function, how can I solve the different size problem using this
> function?

What problem? Wilcoxon tests work quite happily with unequal group sizes. There's some loss of power due to imbalance, but the only way around _that_ is to move observations from one group to the other...

(And exact testing actually solves a slightly different problem than the tie issue, but never mind.)

>
> thanks
>
> net
>
> --
> View this message in context: http://r.789695.n4.nabble.com/Wilcoxon-rank-sum-in-unbalanced-design-tp3447400p3447400.html
> Sent from the R help mailing list archive at Nabble.com.
>
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-- 
Peter Dalgaard
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email: pd.mes_at_cbs.dk  Priv: PDalgd_at_gmail.com

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