[R] Missing at random

[David Winsemius]

On Jan 30, 2011, at 10:01 PM, assaedi76 assaedi76 wrote:

> R users:
> Thanks in advance
>  How to generate missing at random (MAR)?

 > missidx <- sample(1:nrow(dfrm), nrow(dfrm)*frac)
 > is.na(dfrm$measure) <- 1:nrow(dfrm) %in% missidx



>
> assaedi76 at yahoo.com
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> Thanks
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David Winsemius, MD
West Hartford, CT