Hi dear reader,

 

I've been searching the help-archive and found many topics with regard to
the use of combinations, but I can't seem to make sense out of the advice
given. So I posted my question here, my apologies that this has come up for
many times before.

 

 

Example data-set:

Group                  Scores

A                            5

A                            10

A                            9

B                             2

B                             3

 

I have 5 subjects. Those subjects are each assigned to a particular group,
group A or group B. Each subject gets a score on a test (dependant
variable).

 

Now instead of just getting the mean of group A and group B of the sample
I've drawn, I want to list all possible combinations (in this case 10
combinations, to eventually be able to compute for each combination, the
mean of group A and group B.

That is:

Group                  [,1]                       [,2]         .
[,10]

A                            5                             5
9

A                            10                           10
2

A                            9                             2
3

B                             2                             9
5

B                             3                             3
10

 

combn does provide me with 10 possible combinations, but it only lists a
part of the data:

                [,1]         [,2]         [,3]         [,4]         [,5]
[,6]         [,7]         [,8]         [,9]         [,10]

[1,]         5             5             5             5             5
5             10           10           10           9

[2,]         10           10           10           9             9
2             9             9             2             2

[3,]         9             2             3             2             3
3             2             3             3             3

 

 

 

Thanks a lot!!

 

Sarah


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