MSnbase: npcv – R documentation

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npcv

Non-parametric coefficient of variation

Description

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.

Details

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

Value

A numeric.

Author(s)

Laurent Gatto

Examples

set.seed(1)
npcv(rnorm(10))
replicate(10, npcv(rnorm(10)))
npcv(1)
mad(1)
sd(1)

MSnbase

Base Functions and Classes for Mass Spectrometry and Proteomics

v2.16.1

Artistic-2.0

Authors

Laurent Gatto, Johannes Rainer and Sebastian Gibb with contributions from Guangchuang Yu, Samuel Wieczorek, Vasile-Cosmin Lazar, Vladislav Petyuk, Thomas Naake, Richie Cotton, Arne Smits, Martina Fisher, Ludger Goeminne, Adriaan Sticker and Lieven Clement.

Initial release