`dataFrame.columns.stat — sumSquaresWithin()`

Description

The sumSquaresWithin() method of the stat object computes the within-group sum of squares (SSW) for the selected columns.

Signature

dataFrame.columns(...columnNames).stat.sumSquaresWithin()

Scope: columns
Family: stat
Returns: number

Argument

...columnNames ( string[] ): The name of the columns from which to compute the within-group sum of squares.

Returns

ssw (number): The computed within-group sum of squares.

Notes

The method requires at least two selected columns.
The statistic measures the variability within groups.
The value is computed from deviations of observations around their respective group means.
Larger values indicate greater dispersion within groups.
The within-group sum of squares contributes to the computation of ANOVA F-statistics.
The statistic is also known as the residual sum of squares in one-way ANOVA.

Example

// calculate the SSW from the values of 2 columns of the dataFrame
var ssw = dataFrame.columns('group_1', 'group_2').stat.sumSquaresWithin();

// log the SSW
notebook.log(ssw);