search for: cum_time

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2009 Oct 31
1
avoiding loop
...trying to figure out a way to improve my code's efficiency by avoiding the use of loop. I want to calculate a conditional mean(?) given time. For example, from the data below, I want to calculate sum((value|choice==1)/sum(value)) across time. Is there a way to do it without using a loop? time cum_time choice value 1 4 1 3 1 4 0 2 1 4 0 3 1 4 0 3 2 6 1 4 2 6 0 4 2 6 0 2 2 6...