Table 5
Correlation statistics.
| Method | Variable | Variable | Result |
| (1) | (2) | (3) | (4) |
|
|
|||
| BHK | FIRST Tot | NIR | Kendall’s τ = 0.7143 |
| Z value = 1.237 | |||
| prob = 0.2160 | |||
| FIRST Core | NIR | Kendall’s τ = 0.4000 | |
| Z value = 0.490 | |||
| prob = 0.6242 | |||
| NIR | FIRST Tot | Kendall’s τ = 0.7143 | |
| Z value = 1.237 | |||
| prob = 0.2160 | |||
| NIR | FIRST Core | Kendall’s τ = 0.4000 | |
| Z value = 0.490 | |||
| prob = 0.6242 | |||
|
|
|||
| Cox | FIRST Tot | NIR | χ2 = 0.036 |
| prob = 0.8491 | |||
| FIRST Core | NIR | χ2 = 0.319 | |
| prob = 0.5724 | |||
| Cox | NIR | FIRST Tot | χ2 = 0.052 |
| prob = 0.8192 | |||
| NIR | FIRST Core | χ2 = 0.065 | |
| prob = 0.7990 | |||
Notes. Column 1: statistical correlation method: BHK – generalized Kendall’s τ correlation coefficient; Cox – correlation probability by Cox’s proportional hazard model. Columns 2 and 3: independent and dependent variable: NIR pertains to the Ks-band fluxes of the NIR components (components N) coincident with the radio structure centers (except for maxBCG 8495); FIRST Tot pertains to the FIRST total radio as the sum of the flux density of all the FIRST components; FIRST Core pertains to the radio “core” flux density estimated using funtools on circular regions of approximately the same size (~2 arcsec) and centered on the NIR emission regions N. Column 4: statistical results. The test assumes the null hypotheses: “prob” is the probability that there is no correlation between the variables.
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