R help - Oct 2010 - Randomly split a sample in two equal subsamples

Dear all,

I would like to randomly split a sample in two equally large
subsamples. The sample data is stored as a matrix with each row
representing an individual and each column representing some variable
(e.g., name, age, sex, etc.); the first row contains the names of the
variables; the first column contains the individual number (1:n, for n
individuals); the number of individuals is even (so, the overall
number of rows is odd).

I found similar threads (like "random subset"), but I don't know
how
to apply the information from them in my case. Could somebody help me
a little bit? Thanks in advance!

Yoan

Hi Yoan,

Please try ?sample.

Suppose you have 1:n ids of total observations where n is even, you want to
randomly split it into two subsamples, the following code should work.

n <- 20
one.sample <- sort(sample(1:n, n/2))
another.sample <- (1:n)[-one.sample]


Good luck.

Wu

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Thanks, it works!
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