## KURTOSIS_POP

Purpose

The population kurtosis function `KURTOSIS_POP`

is primarily used to determine the characteristics of outliers in a given distribution.

NULL values in `expr`

are ignored.

Returns NULL if all rows in the group have NULL `expr`

values.

Returns 0 if there are one or two rows in `expr`

.

For a given set of values, the result of population kurtosis (`KURTOSIS_POP`

) and sample kurtosis (`KURTOSIS_SAMP`

) are always deterministic. However, the values of `KURTOSIS_POP`

and `KURTOSIS_SAMP`

differ. As the number of values in the data set increases, the difference between the computed values of `KURTOSIS_SAMP`

and `KURTOSIS_POP`

decreases.