On Nov 21, 2012, at 9:05 AM, york8866 wrote:

Hi all,

I had a dataset A like:

TIME  DV
0  0
1   10
5    20
24  30
36   80
48  60
72 15

I would like to add 24 to those values higher than 24 in the TIME column.

I did the following:

If (A$TIME>=24) {
A$TIME <- A$TIME+24}

It did not work.  How should I do it?

You should study the help pages for if and ifelse:

?"if"
?ifelse

--

David Winsemius, MD
Alameda, CA, USA

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