Rule-based vs parametric approaches for developing climate-sensitive site index models: a case study for Scots pine stands in northwestern Spain

Table 6 Summary of parameter estimates and p values for the ten stepwise models fitted

Model	Variable	Estimate	P value	Significance
a	Intercept	-346.374	0.0247899	*
	BIO4	2.46477	0.0115361	*
	BIO5	-4241178	0.0279334	*
	BIO6	4241207	0.0279328	*
	BIO7	4241218	0.0279323	*
	BIO8	112.622	0.0075643002	**
	BIO9	-139.704	0.00228569	**
b	Intercept	-1026.50	0.0288415	*
	BIO4	3.13169	0.00194989	**
c	Intercept	1.69057	\(<2 \cdot 10^{-16}\)	***
\(h_{ip}\)	Intercept	-24.0346	0.0695317	.
	BIO3	1.04831	0.00174623	**
	BIO4	0.0324989	0.0222145	*
	BIO9	-1.65242	0.0175229	*
\(t_{ip}\)	Intercept	126.053	0.083082	.
	BIO2	46.0774	0.00547604	**
	BIO4	0.833430	0.0159734	*
	BIO7	-39.1731	0.00772911	**
	BIO1	-0.256227	0.0468519	*
	BIO1	7.18568	0.0222929	*
	BIO1	-2.05499	0.0326695	*
	BIO1	0.740449	0.0269895	*
\(g_{ip}\)	BIO7	0.289329	0.000100529	***
	BIO8	0.386769	0.0000697722	***
	BIO9	-0.480405	0.000293752	***
\(h_{mmg}\)	Intercept	-48.0693	0.0695317	.
	BIO3	2.09663	0.00174623	**
	BIO4	0.0649979	0.0222145	*
	BIO9	-3.30484	0.0175229	*
\(t_{mmg}\)	BIO2	46.4528	0.0351728	*
	BIO4	1.34853	0.0243512	*
	BIO7	-47.092005	0.0309513	*
mmg	BIO7	0.221143	0.000442736	***
	BIO8	0.301835	0.000241219	***
	BIO9	-0.3674004	0.000600666	***

. significant at 90%; * significant at 95%; ** significant at 99%; *** significant at 99.9%

ISSN: 1297-966X