Table 2.
Logistic regression of sexual orientation on numbers of siblings: change in the model if term (predictor) removed. (Note. The results show the effect of removing one predictor at a time from the regression equation, while leaving the remaining three predictors in the model. The removal of older brothers, older sisters and younger brothers all produced a statistically significant decrease in correct prediction of the groups' sexual orientations.)
| predictor | ΔR2 | change in -2 log likelihooda | significance of the changeb |
|---|---|---|---|
| older brothers | −0.059 | 13.55 | 0.0002 |
| older sisters | −0.028 | 6.51 | 0.0107 |
| younger brothers | −0.035 | 8.04 | 0.0046 |
| younger sisters | <0.001 | 0.01 | 0.9203 |
a
Distributed as χ2 with one degree of freedom.
b
Two-tailed p.