On Mar 29, 2012, at 2:37 PM, inkhorn wrote:
Hello,
Let's say I've drawn a random sample () from a large data frame
(main.df), and I want to create a second random sample (sample2.df)
where
the values in its ID column *are not* in the equivalent ID column in
the
first sample (sample1.df). How would I go about doing this?
In other words:
The values in sample2.df$ID *are not found* in sample1.df$ID, and
both
samples are drawn from main.df.
?"%in%"
sample2.df <- main.df[ ! main.df[, "ID"] %in% sample1.df[, "ID"] , ]
Thanks in advance,
Matt Dubins
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