. 2019 May 10;5(5):e01565. doi: 10.1016/j.heliyon.2019.e01565

Table 2.

Calibration curve equations (mean ± standard deviation, n = 5) and statistical tests used for linearity assessment.

Aflatoxins	Equation	R²	Normality		Maximum normed residual		Homogeneity of variances		Regression		Lack-of-fit
Aflatoxins	Equation	R²	W_Test (5 levels)	W_Critical	G_Test (5 levels)	G_Critical	C_Test	C_Critical	F	F_Critical	F	F_Critical
AFB1	y = (893.67 ± 67.05)x – (17.94 ± 33.88)	0.9934	0.815–0.963	0.686	1.35–1.70	1.764	0.406	0.633	1155.9	7.823	2.82	3.67
AFB2	y = (1086.24 ± 76.90)x – (24.71 ± 28.18)	0.9946	0.722–0.982	0.686	1.14–1.64	1.764	0.336	0.633	1228.5	7.823	1.95	3.67
AFG1	y = (710.97 ± 41.57)x + (0.94 ± 9.80)	0.9923	0.809–0.918	0.686	1.53–1.71	1.764	0.325	0.633	992.9	7.823	1.08	3.67
AFG2	y = (731.35 ± 29.03)x – (14.08 ± 25.20)	0.9917	0.740–0.946	0.686	1.20–1.74	1.764	0.386	0.633	1245.7	7.823	1.84	3.67

R² correlation coefficient, (W_test, W_critical) Shapiro Wilk statistic, (C_test, C_critical) Cochran statistic, (G_test, G_critical) Grubbs statistic, (F, F_critical) F statistic.

Shapino Wilk statistic (normality) : Values in bold represent the coefficients of Shapino Wilk test (W test for 5 levels) and critical value (W critical) at 1%.

Grubbs statistic (Maximum normed residual): Values in bold represent the coefficients of Grubbs test (G test for 5 levels) and critical value (G critical) at 1%.

Cochran statistic (Homogeneity of variances): Values in bold represent the coefficients of Cochran test and critical value (C critical) at 1%.

F statistic (Analysis of variance) : Values in bold represent F values and F critical for Regression, F values and F critical for lack-of-fit at %1.