Table 15 Cross-Validation.

From: Development of fuzzy-based ranking alternatives by hybrid RSM-fuzzy AHP-fuzzy CoCoSo framework sustainable ultrasonic-assisted turning of magnesium alloys

Fold

Train RMSE

Test RMSE

Train R²

Test R²

1

0.103

0.151

0.746

0.650

2

0.112

0.117

0.714

0.725

3

0.104

0.142

0.767

0.627

4

0.100

0.176

0.812

0.885

5

0.095

0.176

0.829

0.641

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