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I have a dataset with 4 years of students, and normally I want to estimate things using each individual year, so I have a for loop as follows for (i in 1:4){} However, the only way I know how to calculate estimates using all four years of data is to put the estimations outside of the loop. Is there anyway to make a for loop that uses all four years at once, then uses each individual year?

Dear all, I recently had to review the current litterature about some medical treatment with two possible variants (let's call them A and B). I collected all available prospective randomized trials about this treatment : I got four trials for the A variant and three for the B variant, all studies comparing one variant to a "suitably choosen" placebo. Two classes of variables are of

Hi, Would someone be able to explain how ruby class/object contexts work from the point of view of a deployed rails application using FASTCGI and noting there are multiple Ruby processes running (say on dreamhost for example). Some questions to help clarify what I''m trying to understand: a) how do incoming URL requests get spread across the multiple Ruby processes (let''s