[R] oversampling code

[Kevin E. Thorpe]

On 11/01/2011 12:32 PM, loubna181 wrote:
> Hi,
> Thanks all for your responses, but as I m a new user of R while trying to
> apply what David suggests I dont know what *"dorm" *refers to.
>
> dfrm[c(rownames(dfrm[*dorm*$Y==1,]), sample(rownames(dfrm[dfrm$Y==0]),
> 0.10)) , ]

I suspect that dorm was a typo and that dfrm is what was meant.

>
> But to give you more details , I'm working on a table calles balance from
> UCI machine learning
> I do have a variable called class and takes 3 values : B, L and R.
> B represents 8% of the total and L and R 46% each one.
> The purpose is to have a data set with 10% of B, 40% of L and 40% of R.
> Thank u
>
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-- 
Kevin E. Thorpe
Biostatistician/Trialist,  Applied Health Research Centre (AHRC)
Li Ka Shing Knowledge Institute of St. Michael's
Assistant Professor, Dalla Lana School of Public Health
University of Toronto
email: kevin.thorpe at utoronto.ca  Tel: 416.864.5776  Fax: 416.864.3016