[R] command to change some vars to missing into my dataset

[Jim Lemon]

Hi Adam,
Looks like you have a matrix or data frame and want to change one or
more observations to NA. I think this will do the trick:

# assume the matrix or data frame is named "ajdat"
randomNA<-function(x,nNA=1) {
 dimx<-dim(x)
 x[sample(1:dimx[1],nNA),sample(1:dimx[2],nNA)]<-NA
 return(x)
}

So if you want three NAs inserted, call:

randomNA(ajdat,3)

Jim


On Fri, Jul 6, 2018 at 6:28 AM, Adam Z. Jabir <Adam.Z.Jabir using outlook.fr> wrote:
> Hi,
>
> I want to simulate missing at random for my dataset. Do you know an easy way to do it?
>
> I want to try not to have the missing’s for the same observations. I mean if one observation is been selected randomly to have missing I don’t want to have all the var of the same obs missing.
>
> I want to be able to choose rate of missing that should be applied.
>
> Thanks,
>
> Adam
>
>
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