Table 2.
Concurrent GRM and 2PLM Item Parameter Estimates and SEs for the 19-Item Constraint Scale From the NEO, SNAP, and TCI
| Item | Original scale | Stem | a | b1 | b2 | b3 | b4 |
|---|---|---|---|---|---|---|---|
| T103 | Persistence | I usually push myself harder than most… | 1.99 (0.22) | −0.58 (0.08) | |||
| N130 | Conscientiousness | I never seem to be able to get organized (R) | 1.96 (0.16) | −1.71 (0.14) | −0.67 (0.08) | −0.16 (0.07) | 0.89 (0.10) |
| S29 | Workaholism | When I start a task, I am determined to finish… | 1.94 (0.23) | −0.96 (0.10) | |||
| N40 | Conscientiousness | I keep my belongings neat and clean | 1.90 (0.15) | −2.17 (0.19) | −0.80 (0.09) | −0.16 (0.08) | 0.97 (0.10) |
| S89 | Impulsivity | I tend to value and follow a rational, … | 1.85 (0.26) | −1.36 (0.13) | |||
| T148 | Novelty seeking | I like to pay close attention to details in… | 1.73 (0.22) | −0.47 (0.09) | |||
| N100 | Conscientiousness | I like to keep everything in its place so I… | 1.60 (0.14) | −2.30 (0.22) | −0.98 (0.11) | −0.15 (0.08) | 1.16 (0.12) |
| S214 | Workaholism | I enjoy working hard | 1.57 (0.20) | −1.28 (0.13) | |||
| N25 | Conscientiousness | I’m pretty good about pacing myself so as to… | 1.55 (0.13) | −2.21 (0.20) | −0.83 (0.11) | −0.27 (0.09) | 1.43 (0.14) |
| S173 | Disinhibition | I usually use careful reasoning when… | 1.50 (0.20) | −1.08 (0.13) | |||
| S154 | Disinhibition | I always try to be fully prepared before I… | 1.45 (0.18) | −1.04 (0.13) | |||
| T62 | Persistence | I am more hard-working than most people | 1.37 (0.20) | −0.36 (0.10) | |||
| S261 | Disinhibition | I work just hard enough to get by (R) | 1.34 (0.16) | −0.72 (0.12) | |||
| S202 | Propriety | When I’m working on something, I’m not… | 1.22 (0.33) | −1.05 (0.16) | |||
| N210 | Conscientiousness | I plan ahead carefully when I go on a trip | 1.22 (0.14) | −2.81 (0.37) | −1.37 (0.19) | −0.49 (0.13) | 1.11 (0.17) |
| N205 | Conscientiousness | There are so many little jobs that need… (R) | 1.22 (0.15) | −2.63 (0.37) | −1.10 (0.18) | −0.28 (0.14) | 1.45 (0.21) |
| T166 | Persistence | I often give up a job if it takes much… (R) | 1.21 (0.21) | −1.64 (0.24) | |||
| S254 | Disinhibition | Before making a decision, I carefully… | 1.10 (0.17) | −1.13 (0.17) | |||
| N230 | Conscientiousness | I’m something of a “workaholic” | 1.09 (0.13) | −1.79 (0.26) | −0.05 (0.14) | 0.90 (0.16) | 2.49 (0.32) |
Note. Letters before the item number indicate the measure to which the item originated (N = NEO-PI-R, S = SNAP-2, and T = TCI). Some items had to be shortened (…) because of space limitations. “R” indicates the item was reverse scored. The “a” parameter represents slope and “b” parameter(s) represents location.