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Table 2.
Statistics of photometric redshift performance obtained for KiDS DR3 experiments with ANNz2 and MLPQNA vs. BPZ.
| Sample | Method | Mean of δz = zph − zsp | Mean of δz/(1 + zsp) | St.dev. of δz/(1 + zsp) | SMADa of δz/(1 + zsp) | % of outliers |δz|/(1 + zsp) > 0.15 |
|---|---|---|---|---|---|---|
| Random subsample | ANNz2 | −3.3 × 10−3 | 3.3 × 10−3 | 0.073 | 0.026 | 3.5% |
| 〈z〉 = 0.332 | MLPQNA | −2.0 × 10−3 | 3.9 × 10−3 | 0.079 | 0.026 | 3.4% |
| BPZb | −1.9 × 10−2 | −1.5 × 10−3 | 0.089 | 0.035 | 4.1% | |
| Random 10% of r < 20, | ANNz2 | −2.4 × 10−3 | 8.3 × 10−3 | 0.102 | 0.034 | 7.1% |
| all from r ≤ 20, | MLPQNA | −3.2 × 10−3 | 7.2 × 10−3 | 0.116 | 0.034 | 7.4% |
| 〈z〉 = 0.489 | BPZb | −5.8 × 10−2 | −1.9 × 10−2 | 0.120 | 0.042 | 8.4% |
| Trained w/o COSMOS, | ANNz2 | −4.4 × 10−2 | 1.2 × 10−2 | 0.183 | 0.091 | 25.0% |
| tested on COSMOS | ANNz2wc | −6.7 × 10−2 | −4.6 × 10−4 | 0.184 | 0.086 | 22.7% |
| 〈z〉 = 0.784 | MLPQNA | −8.0 × 10−2 | −2.7 × 10−3 | 0.204 | 0.086 | 23.6% |
| BPZb | −2.4 × 10−1 | −8.5 × 10−2 | 0.195 | 0.085 | 24.5% | |
| Trained w/o CDFS, | ANNz2 | 3.0 × 10−2 | 5.2 × 10−2 | 0.232 | 0.108 | 25.7% |
| tested on CDFS | ANNz2wc | 3.9 × 10−2 | 5.4 × 10−2 | 0.206 | 0.101 | 26.0% |
| 〈z〉 = 0.742 | MLPQNA | 1.0 × 10−2 | 3.8 × 10−2 | 0.222 | 0.100 | 25.8% |
| BPZb | −1.9 × 10−2 | −7.2 × 10−2 | 0.183 | 0.083 | 23.7% |
Notes. Results for the particular tests are provided in blocks of rows. See text for details.
(a)
SMAD is the scaled median absolute deviation, converging to standard deviation for Gaussian distributions.
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