Table 3.
Results of covariate analyses, entering face and a nuisance variable in a model predicting valence ratings. Note that denominator degrees of freedom are estimated from Satterthwaite approximations without exact F distributions.
| Nuisance Variable |
Effect of Nuisance Variable Within Model |
Effect of Face Within Model F (df) |
Face *Nuisance Variable Interaction |
|---|---|---|---|
| Difficulty | F (1, 52) = 4.15, p <.05 | F(1, 75) = 12.18, p < .01 | ns |
| Unpleasantness | F(1, 157) = 6.98, p< .01 | F(1, 169) = 4.60, p = .03 | ns |
| Accuracy | F(1, 156) = 5.02, p = .03 | F(1, 178) = 19.29, p < .01 | ns |