Table A5.

Summary of the stepwise selection procedure for each of the performed regressions.

Regression	Model	Includes Treatments	R-Squared	Adj. R-Squared	Pred. R-Squared	AIC	SBC
	5	No	0.111	0.090	0.063	1096.44	1140.21
a.PC1	6	Yes	0.117	0.087	0.050	1101.87	1161.55
	7	Yes	0.119	0.084	0.042	1104.94	1172.58
	6	Yes	0.069	0.037	0.005	1122.71	1182.39
a.PC2	7	Yes	0.072	0.038	0.004	1123.29	1186.95
	8	Yes	0.075	0.036	−0.005	1126.14	1197.76
	5	Yes	0.053	0.025	−0.007	1125.60	1177.33
a.PC3	6	Yes	0.059	0.027	−0.011	1126.98	1186.67
	7	Yes	0.062	0.028	−0.013	1127.60	1191.27
	3	Yes	0.044	0.024	−0.002	1123.09	1162.88
b.PC1	4	Yes	0.050	0.025	−0.008	1124.85	1172.60
	5	Yes	0.054	0.024	−0.015	1127.21	1182.92
	3	Yes	0.056	0.039	0.018	1116.21	1152.02
b.PC2	4	Yes	0.065	0.043	0.016	1116.38	1160.15
	5	Yes	0.067	0.011	0.042	1118.39	1170.11
	6	Yes	0.059	0.027	0.005	1120.95	1156.76
b.PC3	7	Yes	0.062	0.028	−0.013	1127.60	1191.27
	8	Yes	0.064	0.027	−0.015	1128.73	1196.37
	3	Yes	0.044	0.026	0.002	1121.41	1157.22
c.PC1	4	Yes	0.054	0.032	0.002	1121.03	1164.80
	5	Yes	0.063	0.036	0.000	1121.42	1173.14
	5	No	0.064	0.045	0.013	1114.81	1154.60
c.PC2	6	Yes	0.069	0.040	−0.002	1120.64	1176.34
	7	Yes	0.071	0.037	−0.012	1123.86	1187.53
	5	Yes	0.042	0.017	−0.013	1127.94	1175.69
c.PC3	6	Yes	0.046	0.018	−0.015	1128.52	1180.25
	7	Yes	0.048	0.016	−0.021	1131.36	1191.04
	4	Yes	0.061	0.039	0.010	1118.11	1161.87
d.PC1	5	Yes	0.066	0.041	0.009	1118.22	1165.97
	6	Yes	0.070	0.041	0.003	1120.33	1176.03
	4	No	0.030	0.012	−0.013	1126.95	1162.76
d.PC2	5	Yes	0.032	0.004	−0.032	1134.07	1185.80
	6	Yes	0.034	0.001	−0.041	1137.27	1196.95
	3	Yes	0.033	0.015	−0.007	1125.80	1161.61
d.PC3	4	Yes	0.037	0.017	−0.008	1125.93	1165.72
	5	Yes	0.041	0.016	−0.014	1128.48	1176.23

AIC = Akaike information criterion; SBC = Schwarz and Bayesian criteria. Diagnostics are reported for the chosen model in italics.