[R] Time data

From: Gregory Pierce <pierce.gregory_at_gmail.com>
Date: Wed, 13 Apr 2011 17:29:17 -0400


Hello fellow R-users,

I have a data set that includes times in the hh:mm format. I am uncertain how to tell R that it is time data. Currently when I try to calculate a mean with this time subset, I get an error message:

> mean(mar2011stats$TT)

[1] NA
Warning message:
In mean.default(mar2011stats$TT) :
  argument is not numeric or logical: returning NA

TT is the column label under which I have stored my time data: (for example, 1:24 to represent one hour and twenty four minutes).

Do I have to convert everything to minutes so that R can deal with it as it would other numerical values?

Thanks,
Greg

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