/**
* Returns the sum of squared deviations of Y from its mean.
*
* <p>If the model has no intercept term, <code>0</code> is used for the mean of Y - i.e., what is
* returned is the sum of the squared Y values.
*
* <p>The value returned by this method is the SSTO value used in the {@link #calculateRSquared()
* R-squared} computation.
*
* @return SSTO - the total sum of squares
* @see #isNoIntercept()
* @since 2.2
*/
public double calculateTotalSumOfSquares() {
if (isNoIntercept()) {
return StatUtils.sumSq(Y.getData());
} else {
return new SecondMoment().evaluate(Y.getData());
}
}
/**
* Returns the sum of squared deviations of Y from its mean.
*
* @return total sum of squares
*/
public double calculateTotalSumOfSquares() {
return new SecondMoment().evaluate(Y.getData());
}
