Table 4.
Robustness check.
| Variables | Model 1a | Model 2b | Model 3c | Model 4d | |||||
|
|
β (SD) | P value | β (SD) | P value | β (SD) | P value | β (SD) | P value | |
| P_Gender | .117 (.028) | <.001 | .072 (.026) | <.001 | .073(.026) | <.001 | .072 (.026) | .002 | |
| P_Age | .012 (.016) | .42 | .015 (.015) | .39 | .016(.015) | .40 | .016 (.015) | .30 | |
| P_ Deadline | .022 (.011) | .02 | .012 (.010) | .27 | .021(.010) | .05 | .023 (.010) | .003 | |
| D_Response Speed | .088 (.008) | <.001 | .067 (.007) | <.001 | .065(.007) | <.001 | .066 (.007) | <.001 | |
| D_Assistance Number | –.038 (.024) | .17 | –.026 (.022) | .36 | –.024(.022) | .36 | –.21(.022) | .35 | |
| P_Rewards | —e | — | .019 (.001) | <.001 | .018(.001) | <.001 | .031(.007) | <.001 | |
| Dtitle_dummy1 | — | — | .180 (.035) | <.001 | .192(.035) | <.001 | .328 (.175) | .009 | |
| Dtitle_dummy2 | — | — | .068 (.032) | .02 | .072 (.032) | .02 | –.070 (.162) | .66 | |
| D_Score | — | — | .414 (.070) | <.001 | .321(.074) | <.001 | –.393 (.310) | .13 | |
| Q_Complexity | — | — | — | — | .058(.015) | <.001 | –.803 (.371) | <.001 | |
| P_Rewards×Q_Complexity | — | — | — | — | — | — | –.007 (.002) | <.001 | |
| Dtitle_dummy1×Q_Complexity | — | — | — | — | — | — | –.033 (.040) | .14 | |
| Dtitle_dummy2×Q_Complexity | — | — | — | — | — | — | .033 (.037) | .78 | |
| D_Score×Q_Complexity | — | — | — | — | — | — | .186 (.078) | .04 | |
aAdjusted R2: 0.105 ; F change: 33.492 (P<.001).
bAdjusted R2: 0.244; F change: 64.256 (P<.001).
cAdjusted R2: 0.251; F change: 13.692 (P<.001).
dAdjusted R2: 0.253; F change: 2.179 (P=.09).
eNot available.