skewness() - Tiger Data

Since 1.3.0 Calculate the skewness from the values in a statistical aggregate. The skewness is the third statistical moment. It is a measure of asymmetry in a data distribution.

Samples

Calculate the skewness of a sample containing the integers from 0 to 100:

SELECT skewness(stats_agg(data))
  FROM generate_series(0, 100) data;

skewness_x
----------
0

Arguments

The syntax is:

skewness(
  summary StatsSummary1D,
  [ method TEXT ]
) RETURNS DOUBLE PRECISION

Name	Type	Default	Required	Description
summary	StatsSummary1D	-	✔	The statistical aggregate produced by a `stats_agg` call
method	TEXT	`sample`	-	The method used for calculating the skewness. The two options are `population` and `sample`, which can be abbreviated to `pop` or `samp`

Returns

Column	Type	Description
skewness	DOUBLE PRECISION	The skewness of the values in the statistical aggregate