Table 2.

Regression models for enthalpy of molecular structures.

Enthalpy
Regression model	Molecular descriptor	R 2	F	Sig
Quadratic model	ABC(G)	0.968	75.655	0.000
	RA(G)	0.960	60.135	0.000
	S(G)	0.959	58.803	0.000
	GA(G)	0.959	58.458	0.000
	H(G)	0.950	47.272	0.000
	HM(G)	0.974	94.975	0.000
	F(G)	0.981	127.722	0.000
Cubic model	ABC(G)	0.967	73.368	0.000
	RA(G)	0.963	64.170	0.000
	S(G)	0.962	63.173	0.000
	GA(G)	0.962	62.761	0.000
	H(G)	0.958	56.399	0.000
	HM(G)	0.974	92.196	0.000
	F(G)	0.980	120.050	0.000
Logarithmic model	ABC(G)	0.710	14.666	0.009
	RA(G)	0.617	9.663	0.000
	S(G)	0.644	10.848	0.017
	GA(G)	0.669	12.116	0.013
	H(G)	0.583	8.394	0.027
	HM(G)	0.705	14.331	0.009
	F(G)	0.692	13.465	0.010
Exponential model	ABC(G)	0.779	21.127	0.004
	RA(G)	0.700	13.982	0.010
	S(G)	0.728	16.043	0.007
	GA(G)	0.754	18.415	0.005
	H(G)	0.670	12.161	0.013
	HM(G)	0.783	21.636	0.003
	F(G)	0.771	20.150	0.004