Table 3.
Item parameters and item-fit at wave 2.
| Location parameter (b) | Discrimination parameter (a) | Item-fit | ||||||
|---|---|---|---|---|---|---|---|---|
| Value | Std. Err. | Z-value | Value | Std. Err. | Z-value | p-value | ||
| 1 | Facial expressions | 2.22 | 0.05 | 41.06 | 1.90 | 0.08 | 22.53 | .040 |
| 2 | Eye contact | 2.25 | 0.04 | 51.43 | 3.13 | 0.18 | 17.20 | .891 |
| 3 | General level of activity | 3.00 | 0.12 | 25.32 | 1.35 | 0.08 | 17.53 | .545 |
| 4 | Self-stimulating gestures | 4.45 | 0.37 | 11.93 | 1.20 | 0.13 | 9.19 | .842 |
| 5 | Vocalizations | 1.59 | 0.05 | 34.74 | 1.31 | 0.05 | 24.62 | .188 |
| 6 | Briskness of response to stimulation | 3.55 | 0.19 | 18.31 | 1.76 | 0.16 | 11.35 | .020 |
| 7 | Relationship | 1.76 | 0.03 | 64.45 | 4.47 | 0.26 | 17.19 | .584 |
| 8 | Attraction | 1.72 | 0.03 | 63.22 | 4.05 | 0.22 | 18.50 | .713 |