Table 4 Regression coefficients and correlation of polynomial models to experimental data in mixtures design of the mashed potato samples

Variable	Model	Coefficients							R2
		β 1	β 2	β 3	β 12	β 13	β 23	β 123
		L	Quadratic	40.90	45.40	112.20	54.00	-125.60		-116.50	-	0.99
a	Linear	11.24	1.98	2.44	-	-	-	-	0.96
b	Cubic	0.40	0.50	-79.80	-42.70	158.50	160.90	-105.20	0.92
Anthocyanin content (mg/kg)	Quadratic	583.20	383.90	115.50	-408.20	302.70	479.70	-	0.86
Storage modulus (kPa)	Cubic	78.00	393.00	1,803.00	-829.00	-2,149.00	4,211.00	-9782.00	0.99
Loss modulus (kPa)	Cubic	14.00	-96.00	917.00	64.00	-1,048.00	-2,535.00	1582.00	0.99