[R] Splitting Data by Row

[Ross Culloch]

Hello fellow R users!

I wonder if someone can help with what i think should be a simple question
but i can't seem to find the answer or work it out.

My data set is as such:

Day Time ID Behaviour
1      9     A1     2
1      10    A2     3
..      ..    ..       ..
4      10   A1     10
4      11   A2      1
..      ..    ..      ..
30     1    B1     14
30     2    C3     4

So basically i have data for several days, for several times, for several
IDs and for several Behaviours

What i want to do is get an activity budget for ID from these data, e.g:

data <- tapply(Behaviour,list(ID,Behaviour),length) 

This will give me a count of the number of times an ID does a certain
behaviour for all the data, which is great - but i want to work out seasonal
and diurnal activity budgets too, therefore i need to break the data down
not just by ID but by day and time, too - I've searched on here and found
nothing i could adapt to my data - it may be that i can't see quite how the
code would work and i've overlooked something of importance!

If anyone can point me in the right direction i'd be most grateful!

Cheers,

Ross
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