Dear All,
I would be most grateful for help on this problem.
I have a binary response variable. It is classified by various factors.
I would like to have a table with;
column 1
frequency response is 1 / (frequency the response is 1 + frequency the
response is 0) #given the classifying factors are the same
column 2...(n-1)
states of classifying factors
column 3
(frequency the response is 1 + frequency the response is 0)
I want to do this to reduce the size of my table so i can use it for
logistic regression without running out of memory.
some example data to illustrate the problem;
response <- c(0,1,0,1,0,0,0,1)
predictor.a <- c(10,10,20,20,50,50,50,50)
predictor.b <- c(2,2,3,3,5,5,5,5)
frame <- data.frame(r = response, p.a = predictor.a, p.b = predictor.b)
> frame
r p.a p.b
1 0 10 2
2 1 10 2
3 0 20 3
4 1 20 3
5 0 50 5
6 1 50 5
desired result........
f p.a p.b freq
0.5 10 2 2
0.5 20 3 2
0.25 50 5 4
many thanks,
Hugh
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