Dear List,
I am working on learning R and have come up with a few questions that I haven'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 a dataframe(containing values of sorting
variables) using a character string located in another dataframe (containing possible
groups of variables) that has been referenced with a numeric index?
If there is, is there a way to do it using a vectorized process, rather than an
iterative with several for loops or something?
Thanks for your consideration,
Paul
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