byMean: Fast conditional mean
In ffbase: Basic Statistical Functions for Package 'ff'

byMean works like a very fast version of tapply with (weighted) FUN=mean or FUN=weighted.mean.

1	byMean(x, by, na.rm = FALSE, weight = NULL, ...)

`x`	`numeric` vector to be averaged
`by`	(list of) `factor(s)` for which the mean will be calculated
`na.rm`	`logical` If `TRUE` `NA` values will be removed
`weight`	`numeric` with of same length as `x`
`...`	not used

array with dimensions of by

ffbase documentation built on Feb. 27, 2021, 5:06 p.m.

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