search for: interpercentil

...ven't been able to answer with books from the local library. I am attempting to find the mean and variance of subsets of a ~140k item vector(lets say variable X). Using groups of 5 variables from a pool of 7, I limit the values of X by only selecting those who remain in the set after sorting on interpercentile ranges of the 5 other variables. There are 21 groups of 5 sorting variables, and if I were to use interquartile ranges, 5^4 possible combinations for each group. So, I am trying to learn to write fast code, while learning R. My questions are these: Is there a way to select a vector from...