International Journal of Concrete Structures and Materials

Table 4 The best subset regression analysis of \( \ln \alpha_{\text{t}} {\kern 1pt} \) (or \( {\kern 1pt} \ln \alpha_{\text{m}} \)) on ln T and β_P.

From: Tests and Analysis on Thermal Expansion Behaviour of Steel Strand used in Prestressed Concrete Structure under Low Temperatures

Response	Model	n	R ²	Mallows Cp	S	ln T	β _P
α _t	1AT	1	0.73	1024	0.10		x^a
	2AT	1	0.24	2935	0.16	x
	3AT	2	0.98	3	0.02	x	x
α _m	4AM	1	0.60	1042	0.07		x
	5AM	1	0.36	1067	0.09	x
	6AM	2	0.99	3	0.01	x	x

^aDenotes considered predictors in the subset regression analysis; n, number of considered predictors.

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