Table 2.

Model standard errors of estimate (SEE) and R² for complete and reduced models for predicting time to first flower for soybean.

Model		Multiplicative		Additive
	N	R2	SEE (d)	R2	SEE (d)
Complete model † (full dataset)	389	0.92	2.84	0.91	2.88
Without non-linear photoperiod function	389	0.90	3.18	0.89	3.34
Without rate of photoperiod change function	389	0.90	4.15	0.87	5.54
Without irradiance function	389	0.87	5.08	0.84	6.64
Without all of the above three functions	389	0.80	7.46	0.75	10.10
Complete model (dependent data)	207	0.92	2.53	0.93	2.89
Complete model (independent data)	187	0.89	3.61	0.90	3.55

^† Model with temperature, non-linear photoperiod, rate of photoperiod change, and daily irradiance functions, and a photoperiod coefficient for each isoline.