Table 2 Performance metrics for random forest regression models with different input features.

From: Enhanced characterization of hydraulic conductivity via standard penetration test for sandy soils and weathered rocks

Model

Input features

R2

MAPE [%]

Training

Test

Training

Test

RF-I

N, e

0.5418

0.2670

7.8411

7.2015

RF-II

N, e, D10, D50

0.6371

0.2911

6.9083

7.4105

RF-III

N, e, D10, D50, Cu, FC

0.6629

0.2652

6.6513

7.5114

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