Hello,

I'm struggling with an elementary problem with R. I have a simple data 
frame such as this one giving the number of accidents subdivided by sex, 
age and region.

sex     age     region          no_of_accidents

F       young   north           10
F       young   south           12
F       old     north           5
F       old     south           7
M       young   north           24
M       young   south           30
M       old     north           12
M       old     south           17

and I would like to build a pivot table, e.g. obtaining the sum of the 
number of accidents for each sex:

sex     age     region          no_of_accidents

F       (any)   (any)           34
M       (any)   (any)           83

but I can't seem to obtain this result simply in R, except by embarking in 
complicated "for" loops.

I have checked the documentation on such functions as "table()" and the 
documentation on "An introduction to R" but couldn't solve the problem. 
Could you please help me with this?

Cheers

Pete


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