Table 3.
General Linear Models Predicting Each of the Three Fit Parameters
| Variable | Full | Reduced | Simple |
|---|---|---|---|
| x-intercept | |||
| Group | 0.72 | 0.77 | 0.96 |
| Education | 0.22 | 0.23 | |
| NART IQ | 0.44 | 0.47 | |
| Vocabulary | 0.96 | 0.47 | |
| Group × Education | 0.25 | ||
| Group × NART IQ | 0.94 | ||
| Group × Vocabulary | 0.91 | ||
| Asymptote | |||
| Group | 0.78 | 0.31 | 0.07 |
| Education | 0.44 | 0.41 | |
| NART IQ | 0.42 | 0.40 | |
| Vocabulary | 0.87 | 0.66 | |
| Group × Education | 0.63 | ||
| Group × NART IQ | 0.48 | ||
| Group × Vocabulary | 0.21 | ||
| Rate | |||
| Group | 0.62 | 0.00 | |
| Education | 0.05 | 0.06 | |
| NART IQ | 0.02 | 0.01 | |
| Vocabulary | 0.16 | 0.19 | |
| Group × Education | 0.00 | 0.01 | |
| Group × NART IQ | 0.13 | ||
| Group × Vocabulary | 0.59 |
Note. Cells show p values for each predictor’s significance in the corresponding model. The full model includes all covariates and interactions. The reduced model drops all nonsignificant interactions but maintains all covariates. The simple model measures only the effect of age group, without any covariates. All probabilities were determined nonparametrically via the method of permutations (see Method section). The simple model is the final model for the x-intercept and asymptote parameters, and the reduced model is the final model for the rate parameter. NART = National Adult Reading Test