[R] Column of probabilities

[David Winsemius]

On Aug 26, 2011, at 2:35 PM, Jim Silverton wrote:

> H all,
>
> I have a 6 x 3 matrix. The last column is simply the sum of of the  
> first two
> rows.
>
> x1  x2   x3
> 1     2    3
> 2     1    3
> 1     0    1
> 2     2    4
> 2     1    3
> 2     1    3
> 0     0    0
>
> I want to create a column of probabilities p, such that for each  
> row, I want
> to find the probability of x1=k and x3 = n divided by the  
> probability that
> x3 = n.
> So I should end up with a column of probabilities:
> 1/4, 3/4, 1/7, 1/7, 3/4, 3/4, 1/7

Probabilities of what? Those don't sum to 1 together or in any sub  
aggregation I can construct.

-- 

David Winsemius, MD
West Hartford, CT