Thanks for all your help, that has worked a treat. To answer your questions, I
want to include the zero rows because I am going to analyse using mixed models
(with dummies for day of week, location etc.) and I thought it was necessary to
include a complete list of time variables, but now I'm won
On Jul 2, 2010, at 11:55 AM, Petr PIKAL wrote:
Hi
did you try aggregate?
aggregate(data[, 5:8],list(data$Date), sum, na.rm=T)
Group.1 verbal self.harm violence_objects violence
1 0 000
2 01/04/07 251539
3 02
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