Table 5
Statistical comparisons of the binary and single-star samples.
| Test | Full | Limited Teff range | ||
| 0% | 20% | |||
|
|
||||
| Gehan generalized Wilcoxon | 0.06 | 0.34 | 0.22 | 0.79 |
| Peto & Peto Wilcoxon | 0.06 | 0.40 | 0.43 | 0.77 |
| Peto & Prentice Wilcoxon | 0.06 | 0.36 | 0.41 | 0.80 |
| logrank | 0.11 | 0.44 | 0.57 | 0.54 |
| Mean N abundances (Kaplan-Meier estimator): | ||||
| Binary sample | 6.79 ± 0.06 | 6.92 ± 0.07 | 6.95 ± 0.03 | 7.12 ± 0.05 |
| Single-star sample | 6.98 ± 0.05 | 7.06 ± 0.08 | ||
Notes. The first four entries (Wilcoxon and logrank tests) give the probabilities that the censored single-star and binary distributions of nitrogen abundances are indistinguishable, for two assumed values of the secondary’s flux contribution to the binary-star spectra. The last two entries give the mean abundances evaluated using the Kaplan-Meier estimator (see Sect. 4.4.2 for details). The “Full” sample is taken from Table 3, whilst the “Limited” sample is for the effective temperature range 26 000−29 000 K.
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