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Frequently Asked Questions about ORANGE Navigator & Optimizer

Question number FAQ-0985

The R-squared value can sometimes be negative, but since it is the square of the correlation coefficient, shouldn't it be impossible for it to be negative?

The adjusted R2 value and cross-validated R2 value can be negative.
※ The simple squared correlation coefficient can equal 1 even when the model value and the actual value are significantly different, so calculations are performed such that R2=1 only when the deviation is 0 (below is the formula for calculating the cross-validated R2).

Last updated date: 2026-07-15