Table 3.
Repeated presentation of items effect: Summary of linear mixed-effects final models for performance accuracy and reaction time.
| Variable | Coefficient or variancea (SE) | z | p | 95% CI |
|---|---|---|---|---|
| Accuracy | ||||
| Fixed effects | ||||
| Intercept | 0.827 (0.015) | 53.79 | <.001 | [0.797, 0.858] |
| Rep (learning rate) | 0.072 (0.026) | 2.77 | .006 | [0.021, 0.122] |
| Rep2 (acceleration) | −0.02 (0.008) | −2.34 | .019 | [−0.036, −0.003] |
| Baseline | 0.084 (0.052) | 1.63 | .104 | [−0.017, 0.185] |
| NV IQ | 0.004 (0.001) | 2.87 | .004 | [0.001, 0.007] |
| Vocab | 0.001 (0.0004) | 3.19 | .001 | [0.001, 0.002] |
| Rep × SLI | −0.062 (0.024) | −2.57 | .01 | [−0.109, −0.015] |
| Rep2 × SLI | 0.025 (0.01) | 2.38 | .017 | [0.004, 0.045] |
| Variance components | ||||
| Intercept | 0.007 (0.002) | [0.004, 0.011] | ||
| Residual | 0.011 (0.001) | [0.009, 0.014] | ||
|
| ||||
| Reaction time (ms) | ||||
| Fixed effects | ||||
| Intercept | 1,220.6 (25.92) | 47.1 | <.001 | [1169.8, 1271.4] |
| Rep (learning rate) | −34.915 (9.57) | −3.65 | <.001 | [−53.673, −16.157] |
| Baseline | 0.225 (0.44) | 5.06 | <.001 | [0.138, 0.312] |
| NV IQ | −4.389 (3.2) | −1.37 | .17 | [−10.657, 1.879] |
| Vocab | −1.061 (1.3) | −0.81 | .421 | [−3.642, 1.521] |
| Variance components | ||||
| Intercept | 23,205 (5,573.8) | [14491, 37156] | ||
| Residual | 30,071 (3,050.7) | [24649, 36686] | ||
Note. Rep = repetition number (0–3); Rep2 = repetition number squared (0–9).
a
For fixed effects, the data given are coefficients; for variance components, variance.