Stata 15 help for sum()

[FN] Mathematical functions

Function

sum(x) Description: the running sum of x, treating missing values as zero For example, following the command generate y=sum(x), the jth observation on y contains the sum of the first through jth observations on x. See [D] egen for an alternative sum function, total(), that produces a constant equal to the overall sum. Domain: all real numbers or missing Range: -8e+307 to 8e+307 (excluding missing)


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