How to establish all possible combinations of 4 variables out of 6 ?
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The main idea is to gather possible combinations of 4 variable out of 6 total design variables. For every combination i will calculate the R square (with my response variable) and then discard the ones that doesn't meet the required R. I also want to do a t-test and a f-test to keep only the best combination at a given time. Given the best combination, i will then obtain the betas of these variables!