To keep the table dimensions the same, try changing the columns to factors...
boxes$y97<-factor(boxes$y97, 1:4)
boxes$y98<-factor(boxes$y98, 1:4)
boxes$y99<-factor(boxes$y99, 1:4)
...
> table(boxes$y98, boxes$y97)
1 2 3 4
1 1 0 1 0
2 0 0 0 0
3 0 0 0 0
4 1 0 0 1
> table(boxes$y99, boxes$y98)
1 2 3 4
1 1 0 0 1
2 0 0 0 0
3 0 0 0 0
4 1 0 0 1
Chris
Abby_UNR wrote:
>
> My problem is that there are 16 possible transitions, but not all possible
> transitions occur at each time step. Therefore, don't think I could do
> something easy like create a table for each time step and add them
> together, for example:
>
>> t1.boxes <- table(boxes$y98, boxes$y97)
>> t1.boxes
>
> 1 3 4
> 1 1 1 0
> 4 1 0 1
>> t2.boxes <- table(boxes$y99, boxes$y98)
>> t2.boxes
>
> 1 4
> 1 1 1
> 4 1 1
>>
>
>
--
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