Method Status Status D.P. R2(Q2) MAE (kg/m3)
Internal validation Internal validation LOCO-CV 15015 0.9905 10.3470
LOAO-CV 15015 0.9894 11.3498
LOILO-CV 15015 0.9907 10.2623
LODPO-CV 15015 0.9921 9.3723
External validation External validation Training set 15015 0.9922 9.3290
Testing set 4320 0.9921 9.3606
Overall data set Overall data set Overall data set 19335 0.9922 9.3361