| RMSE | α | β | tα | tβ | pα | pβ |
OLS | 8.1313 | −0.1970 | 0.8917 | −0.8364 | 3.3198 | 0.4084 | 0.0000 |
Huber | 8.2699 | −0.3976 | 1.1532 | −2.2717 | 5.7773 | 0.0292 | 0.0000 |
Bisquare | 8.4083 | −0.4299 | 1.2958 | −2.4561 | 6.4922 | 0.0190 | 0.0000 |
Fuzzy | 8.1438 | −0.2747 | 0.9121 |
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