Table 1 Validity test results of the linear regression models between the dissolved concentration of metals (as dependent variable) and the DGT labile concentrations (as independent variable), Eq. (1) shown in Fig. 3
Normality | Normality | Homoscedasticity | Homoscedasticity | p-value | R2 | N | |
|---|---|---|---|---|---|---|---|
Shapiro | Lilliefors | Breusch-Pagan | Goldfeld-Quandt | ||||
Cd | 1.99 × 10−1 | 3.89 × 10−1 | 2.51 × 10−1 | 9.81 × 10−1 | 0.000 | 0.89 | 67 |
Ni | 1.00 × 10−4 | 4.39 × 10−5 | 1.35 × 10−1 | 8.48 × 10−1 | 4.00 × 10−7 | 0.30 | 72 |
Pb | 8.51 × 10−2 | 4.05 × 10−1 | 8.07 × 10−2 | 8.00 × 10−1 | 1.90 × 10−6 | 0.28 | 68 |