Table 3.
ACT-R model parameter values and fit indices for fits to d’ accuracy data with a threshold in Wickelgren and Corbett (1977)
| Parameter | Fit index | ||||||
|---|---|---|---|---|---|---|---|
| Subject | F | s | tstim | τ | AIC | BIC | R2 |
| PB | 589 | 0.41 | 211 | –0.89 | 21.6 (18.6) | 21.0 (18.0) | .959 (.958) |
| EC | 967 | 0.25 | 240 | 0.43 | 15.4 (16.0) | 14.9 (15.4) | .956 (.955) |
| SS | 731 | 0.58 | 295 | –0.10 | 21.9 (21.5) | 21.4 (21.0) | .875 (.874) |
| CL | 766 | 0.36 | 114 | 0.30 | 17.6 (17.5) | 17.0 (17.0) | .892 (.893) |
| CM | 1391 | 0.25 | 32 | 0.26 | 15.9 (16.0) | 15.4 (15.4) | .954 (.954) |
| SJ | 910 | 0.68 | 176 | –0.13 | 18.7 (17.4) | 18.1 (16.8) | .888 (.893) |
| Mean | 892 | 0.42 | 178 | –0.02 | 18.5 (17.8) | 18.0 (17.3) | .921 (.921) |
| Group | 945 | 0.42 | 166 | 0.06 | 4.0 (4.3) | 3.5 (3.7) | .981 (.981) |
Note. “Mean” indicates the mean of the individual-subject values and “Group” indicates the value from a fit to the group data. Values in parentheses are from simulation of the model using the parameters obtained from the analytic fits to the data.