Open Access
Table 4.
Overview of the samples used in this paper and the number of sources contained in each of them.
| Name of the sample | # of sources |
|---|---|
| Parent sample | 477 |
| Double-peak sample | 248 |
| U | 206 |
| UDPI | 105 |
| UDPR | 66 |
Notes. The unbiased sample U, the inclusive unbiased double-peak sample UDPI, and the restrictive unbiased double-peak sample UDPR are described in Sect. 4.1.3.
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