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Non-parametric coefficient of variation

Source: R/utils.R
npcv.Rd

Calculates a non-parametric version of the coefficient of variation where the standard deviation is replaced by the median absolute deviations (see mad for details) and divided by the absolute value of the mean.

Usage

npcv(x, na.rm = TRUE)

Arguments

x

A numeric.

na.rm

A logical (default is TRUE indicating whether NA values should be stripped before the computation of the median absolute deviation and mean.

Value

A numeric.

Details

Note that the mad of a single value is 0 (as opposed to NA for the standard deviation, see example below).

Author

Laurent Gatto

Examples

set.seed(1)
npcv(rnorm(10))
#> [1] 5.852407
replicate(10, npcv(rnorm(10)))
#>  [1]  3.112625  6.088948  4.928480  5.534139  6.124995  2.354319  2.996464
#>  [8]  6.049891 11.716089  3.265193
npcv(1)
#> [1] 0
mad(1)
#> [1] 0
sd(1)
#> [1] NA