help with if statement

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?

Thanks,



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