[R] Permutation Distribution

From: Jacob van Wyk <jlvw_at_na.rau.ac.za>
Date: Thu 20 Jul 2006 - 17:08:43 EST


Hallo  

Is there an elegant way to do the following:  

Dataset consists of 2 variables: var1: some measurements, and var2: a grouping variable with two values, 1 and 2. There are (say) 10 measurements from group 1 and 15 measurements from group 2. The idea is to study the permutation distribution of mean(group 1) * mean(group2). One way would be to permute 1s and 2s and select the corresponding measurements; calculate the difference in means. Redo this 1000 times, say. Etc.  

Any help is much appreciated.
Thanks
Jacob    

Jacob L van Wyk
Department of Statistics
University of Johannesburg, APK
P O Box 524
Auckland Park 2006
South Africa
Tel: +27 11 489 3080
Fax: +27 11 489 2832    

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