[R] Random sample from a data frame where ID column values don't match the values in an ID column in a second data frame

inkhorn matt.dubins at gmail.com
Fri Mar 30 15:05:44 CEST 2012

Okay thanks to your help I figured it out and stuck the code in a function:

df.sample.exIDs = function(main.df, sample1.df, n, ID1.name, ID2.name) {
  main.ID1.notin.ID2 = main.df[!main.df[,ID1.name] %in%
  sample2.df = main.ID1.notin.ID2[sample(nrow(main.ID1.notin.ID2), size=n),]

Matt Dubins

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