`dataFrame.column.stat — shapiroWilk()`

Description

The shapiroWilk() method of the stat object evaluates whether the values of the selected column follow a normal distribution using the Shapiro-Wilk test.

Signature

dataFrame.column(columnName).stat.shapiroWilk({ sorted: false })

Scope: column
Family: stat
Returns: object

Arguments

columnName (string): The name of the column from which to calculate statistics.
options (object): Shapiro–Wilk test options.

Option

sorted (boolean)

Indicates whether the values are already sorted in ascending order.

Sorted: true
Not sorted: false (default)

Returns

stat (object)

The Shapiro-Wilk test statistics:

SW_stat: the Shapiro-Wilk statistic.
p_value: the associated p-value.

Note

Small p-values indicate stronger evidence against normality.

Example

// perform the Shapiro-Wilk test
var stat = dataFrame.column('Speed_of_Impact').stat.shapiroWilk();

// log the test stats
notebook.log(stat);