Re: [R] randomly select duplicated entries

[Marc Schwartz]

on 07/09/2008 02:17 PM Juliet Hannah wrote:

Using this data as an example

dat <- read.table(textConnection("Id         myvar
12 1
12 2
12 6
34 9
34 4
34 8
65 15
65 23"), header = TRUE)
closeAllConnections()

how can I create another data set that does not have duplicate entries
for 'Id', but the included values
are randomly selected from the available ones.

Thanks!

Juliet

> aggregate(dat$myvar, list(dat$Id), sample, 1)
  Group.1  x
1      12  6
2      34  4
3      65 15

> aggregate(dat$myvar, list(dat$Id), sample, 1)
  Group.1  x
1      12  2
2      34  9
3      65 15

> aggregate(dat$myvar, list(dat$Id), sample, 1)
  Group.1  x
1      12  1
2      34  8
3      65 23


HTH,

Marc Schwartz

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