[R] Compiling a contingency table of counts by case

[Jacques VESLOT]

what's different from:
 > with(dat, tapply(x, list(name,case), sum))
       1  2  3
Joe   1  1 NA
John NA  1 NA
Karl NA NA  0
Mike  1  0  1

and how to deal with this table ?
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Jacques VESLOT

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hadley wickham a écrit :
>>I have asked a similar question before but this time
>>the problem is somewhat more involved. I have the
>>following data:
>>
>>case;name;x
>>1;Joe;1
>>1;Mike;1
>>1;Zoe;1
>>2;Joe;1
>>2;Mike;0
>>2;Zoe;1
>>2;John;1
>>3;Mike;1
>>3;Zoe;0
>>3;Karl;0
>>
>>I would like to count the number of "case"
>>in which any two "name"
>>
>>a. both have "x=1",
>>b. the first has "x=0" - the second has "x=1",
>>c. the first has "x=1" - the second has "x=0",
>>d. both have "x=0",
> 
> 
> One way is to use the reshape package:
> 
> dat <- read.delim("clipboard", sep=";")
> dat <- rename(dat, c(x=value))
> cast(dat, name ~ case)
> 
> (which doesn't give you exactly what you want, but I think might be
> more illuminating)
> 
> Hadley
> 
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