[R] Problems with sample variance

Peter Alspach PAlspach at hortresearch.co.nz
Thu May 21 05:55:38 CEST 2009

Tena koe Chloe



BTW, it is better to use more than single letters in name your objects
to reduce the chance of conflicting with a standard R object.

HTH ...

Peter Alspach

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of Chloe Smith
> Sent: Thursday, 21 May 2009 12:33 p.m.
> To: r-help at r-project.org
> Subject: [R] Problems with sample variance
> Dear R users,
> I am a beginner to R. I generated 1000 samples with 15 data 
> in each sample
> I tried finding the variance for each sample
> I used the code:
> m=1000;n=15
> > r<-rnorm(15000)
> > for(i in 1:m){
> x=data[,i]
> v=var(x)}
> what I got was just the variance for the last sample i.e. the 
> 1000th sample
> but what I want is 1000 variance.
> Does anyone know what I did wrong?
> Thanks
> Chloe Smith
> --
> View this message in context: 
> http://www.nabble.com/Problems-with-sample-variance-tp23645919
> p23645919.html
> Sent from the R help mailing list archive at Nabble.com.
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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.

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