I've got a dataset which looks like this in the beginning:
cbr dust smoking expo
1 0 0.20 1 5
2 0 0.25 1 4
3 0 0.25 1 8
4 0 0.25 1 4
5 0 0.25 1 4
(till no. 1240, anyway, a huge set)
I have to analyse cbr and smoking, I know it works with chisq.test() for the
whole set, but I only need cbr and smoking, and I have no idea how to
extract them.
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