Tuesday, June 9, 2020

skewness

A measure of shape. Provides a number to represent the relative positive or negative skew of a distribution. Perfectly normal distributions have a skewness of 0. Negative numbers indicate left skew, with positive numbers indicating right skew. If you get a skew number less than -1 or greater than 1, it is considered to be approaching extreme.

I was hoping for a table of values which showed .5, 1.0, 1.5, etc and the degree of extremeness of skew, but didn't find one.

R Example

> library(e1071)
> x <- rnorm(100)
> skewness(x)
[1] 0.1277998

rnorm is a random distribution generator.

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