See my response to your thread controling the size of vectors in a
matrix. Please do not create multiple threads on the same day asking
basically the same question, especially if you cannot substantially
improve the clarity and quality of the post.
Multiple threads asking the same question badly within the span of few
hours leads to people missing out on other people's response and thereby
essentially wasting their time.
raymond chiruka wrote:
l would like to create the following matrice
treatmentgrpstrata
11 11 11 12
12 12 21 21 21
22 22 22 l should be able to
choose the size of the treatment grps and stratas the method l used intially
creates the matrice randomly
n=20
m - cbind( treatmentgrp = sample( 1:2,n, replace=T ),
strata= sample( 1:2, n, replace=T ),
survivalTime = rexp( n, rate=0.07 ),
somethingElse = rexp( n, rate=0.02 )
thanks
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
