Table 2.

Summary of prediction analyses for the entire sample (R ² total), the training sample (R ² training), and the test sample (R ² test)

Measure	Method	R 2 total	R 2 training	R 2 test	R 2 shrinkage
All	NN	0.88	0.92	0.84	0.07
All	SVM	0.85	0.86	0.84	0.03
11 LBR	NN	0.83	0.83	0.83	0.00
All+	NN	0.87	0.91	0.83	0.08
Thickness+	NN	0.86	0.89	0.83	0.06
Volume+	NN	0.85	0.88	0.82	0.06
All	MLR	0.87	0.92	0.82	0.10
Area+	NN	0.82	0.83	0.82	0.01
All	RF	0.89	0.98	0.81	0.17
All+	MLR	0.85	0.90	0.81	0.09
All	RR	0.84	0.89	0.80	0.10
All+	RR	0.83	0.87	0.80	0.07
All+	SVM	0.81	0.83	0.79	0.04
Thickness+	MLR	0.80	0.83	0.78	0.05
Area+	RF	0.88	0.97	0.78	0.19
Area+	MLR	0.79	0.80	0.78	0.03
Volume+	RF	0.87	0.97	0.78	0.19
11 LBR	KNN	0.79	0.80	0.77	0.03
11 LBR	RF	0.86	0.95	0.77	0.18
All+	RF	0.87	0.97	0.77	0.20
All	KNN	0.79	0.83	0.76	0.06
Thickness+	RR	0.78	0.80	0.75	0.05
Area+	RR	0.77	0.78	0.75	0.03
Volume+	RR	0.77	0.79	0.75	0.05
Thickness+	RF	0.86	0.97	0.74	0.22
Volume+	MLR	0.77	0.81	0.73	0.08
Thickness+	SVM	0.74	0.75	0.73	0.02
11 LBR	MLR	0.72	0.71	0.73	−0.01
Area+	SVM	0.73	0.73	0.73	0.01
All+	KNN	0.75	0.78	0.72	0.06
Volume+	SVM	0.72	0.73	0.71	0.03
11 LBR	RR	0.70	0.69	0.70	−0.01
Volume	NN	0.75	0.80	0.70	0.10
Volume+	KNN	0.73	0.77	0.68	0.09
Thickness	NN	0.68	0.69	0.66	0.03
Volume	KNN	0.68	0.72	0.65	0.07
Volume	MLR	0.66	0.68	0.65	0.04
Volume	RF	0.79	0.96	0.64	0.31
Volume	SVM	0.64	0.63	0.64	−0.01
Volume	RR	0.66	0.67	0.64	0.03
Thickness	MLR	0.64	0.67	0.61	0.06
11 LBR	SVM	0.61	0.61	0.61	−0.01
Thickness	RR	0.63	0.66	0.60	0.06
Thickness+	KNN	0.68	0.75	0.60	0.15
Thickness	SVM	0.58	0.59	0.58	0.01
Area	NN	0.59	0.61	0.57	0.04
Thickness	RF	0.75	0.96	0.55	0.41
Area	MLR	0.57	0.61	0.53	0.08
Area	RR	0.55	0.58	0.52	0.06
Area+	KNN	0.57	0.61	0.52	0.09
Thickness	KNN	0.53	0.56	0.50	0.07
Area	SVM	0.51	0.53	0.49	0.04
Area	RF	0.71	0.95	0.48	0.47
Area	KNN	0.45	0.50	0.40	0.10

Indicated also is the shrinking factor (R ² shrinking: R ² training ‐ R ² test).

The R ² test values >= 0.8 are printed in bold and italic letters. In addition they are marked in deep grey.

The R ² test values >= 0.7 are marked in light grey shading.