Table 3
Selection statistics.
| Selection | QSOs | Stars | Galaxies | All |
|---|---|---|---|---|
| All | 268 230 | 389 317 | 1 090 500 | 70 920 904 |
| Relative frequency in full sample | 0.3782% | 0.5489% | 1.538% | |
| Relative frequency in spec sample | 15.34% | 22.27% | 62.38% | |
| Colour and variability QSO candidate | 31 404 | 32 | 191 | 70 503 |
| Completeness | 12.53% | 0.011% | 0.018% | 0.1237% |
| Purity | 99.3% | 0.10% | 0.60% | |
| Colour and variability star candidate | 15 | 21 129 | 194 | 2 995 546 |
| Completeness | 0.006% | 7.24% | 0.018% | 5.256% |
| Purity | 0.07% | 99% | 0.91% | |
| Colour and variability galaxy candidate | 28 | 25 | 28 076 | 107 227 |
| Completeness | 0.011% | 0.009% | 2.62% | 0.1881% |
| Purity | 0.10% | 0.09% | 99.8% | |
| Variability QSO candidate | 75 690 | 12 704 | 39 284 | 3 390 617 |
| Completeness | 28.2% | 3.26% | 3.60% | 4.781% |
| Purity | 59.3% | 9.95% | 30.8% | |
| Variability star candidate | 14 005 | 207 701 | 216 312 | 22 854 151 |
| Completeness | 5.22% | 53.4% | 19.84% | 32.225% |
| Purity | 3.20% | 47.4% | 49.4% | |
| Variability galaxy candidate | 12 470 | 44 170 | 228 634 | 9 140 797 |
| Completeness | 4.65% | 11.35% | 20.97% | 12.889% |
| Purity | 4.37% | 15.48% | 80.1% | |
| Colour QSO candidate | 96 050 | 237 | 1 045 | 277 394 |
| Completeness | 38.3% | 0.081% | 0.098% | 0.4867% |
| Purity | 98.7% | 0.24% | 1.07% | |
| Colour star candidate | 17 | 23 111 | 319 | 3 495 123 |
| Completeness | 0.007% | 7.92% | 0.030% | 6.133% |
| Purity | 0.07% | 98.6% | 1.36% | |
| Colour galaxy candidate | 152 | 73 | 73 112 | 322 126 |
| Completeness | 0.061% | 0.025% | 6.82% | 5.65% |
| Purity | 0.21% | 0.10% | 99.7% | |
| Schmidt region | 85 012 | 24 576 | 79 279 | 5 484 750 |
| Completeness | 31.7% | 6.31% | 7.27% | 7.734% |
| Purity | 45.0% | 13.01% | 42.0% | |
Notes. Sample statistics of selections in variability and colour, including counts, completeness, and purity (see Eq. (8)). In row 1 (All), we compare spectroscopically classified objects to the full fitted source count and to the full set with spectroscopic classes to get relative frequencies in each set. In rows 5–7 and 11, for computing purity and completeness, selection counts are compared to the total spectroscopic counts. In rows 2–4 and 8–10, comparisons also require matches in WISE and PS1, because colours are used.
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