From: Andrew Robinson <A.Robinson_at_ms.unimelb.edu.au>

Date: Fri, 29 Apr 2011 08:24:01 +1000

Date: Fri, 29 Apr 2011 08:24:01 +1000

On Thu, Apr 28, 2011 at 05:58:24PM -0400, Dat Mai wrote:

> I'm trying to find the variance of various outputs in a matrix:

*>
**> for(l in 2:vl){
**> for(o in 1:(l-1)){
**>
**> # Make sure the inputs are for the matrix "m"
**> input3=rownames(v)[o]
**> input4=colnames(v)[l]
**>
**> r=t[(t$Rec1==input3 & t$Rec2==input4),output]
**>
**> if(length(r)==0){
**> r=t[(t$Rec1==input4 & t$Rec2==input3),output]
**> }
**>
**> v[l,o]=var(q,na.rm=TRUE)
**> v[o,l]=var(q,na.rm=TRUE)
**> v[l,l]=var(q,na.rm=TRUE)
**>
**> }
**> }
**>
**> Each output will yield multiple results, since each input length varies.
**> I'm not sure if this is the right way to go about finding the variance of
**> each pair, but this is what I've done.
**> The main issue I have with this now is that the results in every box in the
**> matrix yield the same exact number, even though that most likely shouldn't
**> happen.
**>
**> The question is: "How would I find the variance of each pair of inputs?"
**>
**> [[alternative HTML version deleted]]
**>
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-- Andrew Robinson Program Manager, ACERA Department of Mathematics and Statistics Tel: +61-3-8344-6410 University of Melbourne, VIC 3010 Australia (prefer email) http://www.ms.unimelb.edu.au/~andrewpr Fax: +61-3-8344-4599 http://www.acera.unimelb.edu.au/ Forest Analytics with R (Springer, 2011) http://www.ms.unimelb.edu.au/FAwR/ Introduction to Scientific Programming and Simulation using R (CRC, 2009): http://www.ms.unimelb.edu.au/spuRs/ ______________________________________________ R-help_at_r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.Received on Thu 28 Apr 2011 - 22:30:07 GMT

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