Table 4.
K2 Test of D’Agostino tests the null hypothesis that a sample comes from a normal distribution.
| Source | K2 | Pvalue | Shapi.– | Pvalue |
|---|---|---|---|---|
| Stati. | (χ2 Prob.) | Wilk | (Prob.) | |
| PG 1553+113 | 56.8 | 4.6 × 10−13 | 0.972 | 4.7 × 10−8 |
| PKS 0447−439 | 101.3 | 1.0 × 10−22 | 0.935 | 9.9 × 10−14 |
| PKS 2155−304 | 222.1 | 5.8 × 10−49 | 0.893 | 6.4 × 10−18 |
| PKS 0426−380 | 90.7 | 2.0 × 10−20 | 0.927 | 1.2 × 10−14 |
| PKS 0301−243 | 721.4 | 2.2 × 10−157 | 0.607 | 8.1 × 10−32 |
| PKS 0537−441 | 185.4 | 5.6 × 10−41 | 0.815 | 2.9 × 10−23 |
Notes. It is based on the tests by D’Agostino and Pearson (D’Agostino 1970; D’Agostino & Pearson 1973) and combines skew and kurtosis to produce an omnibus test of normality. Similarly, the Shapiro–Wilk test quantifies how likely it is that the data were drawn from a Gaussian distribution (Shapiro & Wilk 1965).
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