 Hello all,
I'm trying to modify a single column of a data frame to remove randomly half of the values. I want to do it within a function, but can not assign the modified column back into the data frame. It was easy and successful without a function, so I suspect the problem is the call of the single column within the function.

removedata<-function(datafull,var.removed)
{
attach(datafull)
NArandom<-rnorm(n=length(var.removed), mean=0, sd=1)
for (i in 1:length(var.removed))
  if(NArandom[i]>0) 
    var.removed[i]<-"NA" 
datamiss<<-datafull
detach(datafull)
}

-- Yuval Sapir, PhDResearcherInstitute of Evolution, Haifa UniversityHaifa, Israel 3190‎

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