skew: Skewness Index

In retimes: Reaction Time Analysis

Description

Calculate the skewness index of an empirical distribution.

Usage

skew(x)

Arguments

x	Vector of data.

Details

The skewness measures the asymmetry of a probability distribution. If a positive skewness identifies a greater right tail, a negative skewness is symptom of a greater left tail of the distribution.

The skewness is calculated as: k_{3} / k_{2}^{1.5}, where k_{2} and k_{3} are respectively the second and the third moment of the distribution.

Value

The skewness index.

Author(s)

Davide Massidda [e-mail]

Examples

# Vector of reaction times from Heathcote (1996):
RT <- c(474.688, 506.445, 524.081, 530.672, 530.869,
        566.984, 582.311, 582.940, 603.574, 792.358)
skew(RT)

Example output

Reaction Time Analysis (version 0.1-2)
[1] 1.702413

retimes documentation built on May 2, 2019, 12:34 p.m.