Table IV. Sequential regression results...

Table IV.

Sequential regression results

Sequence (k)	n	Variables (i) in Sequential regression	Regression coefficient	Standard coefficient	η²	Adjusted R²	Δ R²
DV: lnTotal Price
1	59	lnNumber of Tons	0.77***	0.76***	0.58	0.57	–
2	54	lnNumber of Tons	0.18*	0.17*	0.01	0.84	0.27
2	54	lnNumber of Containers	0.93***	0.78***	0.27	0.84	0.27
3	54	lnNumber of Tons	0.17 ns	0.17 ns	0.01	0.84	0.00
		lnNumber of Containers	0.93***	0.78***	0.27
		invWage Rate	4.34 ns	0.04 ns	0.00
4	54	lnNumber of Tons	0.16 ns	0.16 ns	0.01	0.83	−0.01
		lnNumber of Containers	0.89***	0.75***	0.21
		invWage Rate	1.82 ns	0.02 ns	0.00
		8(a) sole source	0.23 ns	0.08 ns	0.00
		8(a) competed	0.24 ns	0.05 ns	0.00
		HUBZone	0.24 ns	0.05 ns	0.00
		SDVOSB	−0.08 ns	−0.01 ns	0.00
		Total SB	0.18 ns	0.07 ns	0.00
5	49	lnNumber of Tons	0.05 ns	0.04 ns	0.00	0.84	0.01
		lnNumber of Containers	0.93***	0.81***	0.24
		invWage Rate	5.29 ns	0.05 ns	0.00
		8(a) sole source	0.47*	0.18*	0.01
		8(a) competed	0.08 ns	0.02 ns	0.00
		HUBZone	0.01 ns	0.00 ns	0.00
		SDVOSB	−0.23 ns	−0.03 ns	0.00
		Total SB	0.09 ns	0.03 ns	0.00
		Number of Offers	0.08*	0.19*	0.01

Sequence (k)	n	Variables (i) in Sequential regression	Regression coefficient	Standard coefficient	η²	Adjusted R²	Δ R²
DV: lnTotal Price
1	59	lnNumber of Tons	0.77***	0.76***	0.58	0.57	–
2	54	lnNumber of Tons	0.18*	0.17*	0.01	0.84	0.27
2	54	lnNumber of Containers	0.93***	0.78***	0.27	0.84	0.27
3	54	lnNumber of Tons	0.17 ns	0.17 ns	0.01	0.84	0.00
		lnNumber of Containers	0.93***	0.78***	0.27
		invWage Rate	4.34 ns	0.04 ns	0.00
4	54	lnNumber of Tons	0.16 ns	0.16 ns	0.01	0.83	−0.01
		lnNumber of Containers	0.89***	0.75***	0.21
		invWage Rate	1.82 ns	0.02 ns	0.00
		8(a) sole source	0.23 ns	0.08 ns	0.00
		8(a) competed	0.24 ns	0.05 ns	0.00
		HUBZone	0.24 ns	0.05 ns	0.00
		SDVOSB	−0.08 ns	−0.01 ns	0.00
		Total SB	0.18 ns	0.07 ns	0.00
5	49	lnNumber of Tons	0.05 ns	0.04 ns	0.00	0.84	0.01
		lnNumber of Containers	0.93***	0.81***	0.24
		invWage Rate	5.29 ns	0.05 ns	0.00
		8(a) sole source	0.47*	0.18*	0.01
		8(a) competed	0.08 ns	0.02 ns	0.00
		HUBZone	0.01 ns	0.00 ns	0.00
		SDVOSB	−0.23 ns	−0.03 ns	0.00
		Total SB	0.09 ns	0.03 ns	0.00
		Number of Offers	0.08*	0.19*	0.01

Notes:

p < 0.05;

***

p < 0.001; ns stands for non-significant; Adjusted R² is the percent of variance in the DV (price) that is explained by the IVs, adjusted by the number of predictors in the model; η² is the percent of variance in the DV (price) that is explained by each IV

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