Table 6.
Prediction of publication performance
| Model 1 | Model 2 | Model 3 | Model 4 | Model 5 | Model 6 | |
|---|---|---|---|---|---|---|
| All | All | High univ tier | Low univ tier | High univ tier | Low univ tier | |
| Age | .001 (.002) | .002 (.002) | −.003 (.004) | .003 (.003) | −.003 (.004) | .004 (.003) |
| Female | −.110** (.034) | −.109** (.034) | −.185*** (.050) | −.062 (.046) | −.184*** (.050) | −.063 (.046) |
| Fellowship | .210*** (.052) | .204*** (.052) | .207*** (.057) | .212† (.119) | .200*** (.057) | .202† (.119) |
| Regular Ph.D. | ||||||
| Professional Ph.D. | .212*** (.041) | .218*** (.041) | .214*** (.065) | .232*** (.054) | .212** (.065) | .239*** (.054) |
| International Ph.D. | .261*** (.044) | .243*** (.044) | .243*** (.061) | .279*** (.063) | .227*** (.061) | .258*** (.062) |
| Ph.D. in Science | ||||||
| Ph.D. in Engineering | .172*** (.045) | .170*** (.045) | .219*** (.056) | .105 (.074) | .216*** (.056) | .105 (.074) |
| Ph.D. in Agriculture | .196** (.065) | .185** (.065) | .135 (.085) | .265** (.099) | .123 (.085) | .259** (.099) |
| Ph.D. in Health | .105* (.046) | .112* (.046) | .106† (.063) | .081 (.071) | .112 † (.063) | .088 (.070) |
| Ph.D. in Humanity | .092 (.059) | .108† (.059) | .146† (.081) | .052 (.088) | .162* (.081) | .063 (.088) |
| Ph.D. in Social Sci | −.104† (.060) | −.105† (.060) | −.068 (.084) | −.144† (.088) | −.069 (.084) | −.150† (.087) |
| Ph.D. in Others | .099 (.065) | .102 (.065) | .328*** (.086) | −.133 (.098) | .324*** (.086) | −.123 (.098) |
| Univ tier | .033* (.013) | .033** (.013) | ||||
| Job motive | −.170* (.080) | −.175* (.080) | −.273** (.099) | −.029 (.132) | −.280** (.099) | −.029 (.133) |
| Academic motive | .148*** (.029) | .152*** (.029) | .090* (.040) | .205*** (.042) | .091* (.040) | .207*** (.042) |
| Official supervisor | −.020 (.013) | −.002 (.018) | −.038* (.019) | |||
| Internal faculty | .000 (.011) | .025 (.015) | −.025† (.015) | |||
| External faculty | .039* (.016) | .059** (.022) | .021 (.022) | |||
| Non-faculty | −.010 (.012) | −.003 (.016) | −.009 (.019) | |||
| #Faculty = 0 | .008 (.045) | −.026 (.061) | .048 (.067) | |||
| #Faculty = 1 | ||||||
| #Faculty = 2 | .003 (.030) | .054 (.043) | −.056 (.043) | |||
| Chi-squared stat | 167.356*** | 154.445*** | 98.615*** | 101.888*** | 91.142*** | 92.576*** |
| Log likelihood | −8294.305 | −8318.113 | −3959.089 | −4312.664 | −3968.817 | −4328.656 |
| N | 3563 | 3572 | 1701 | 1862 | 1704 | 1868 |
Unstandardized coefficients (standard errors in parentheses). Two-tailed test. † p < .10; * p < .05; ** p < .01; *** p < .001. Negative binomial regressions. Regular Ph.D., Ph.D. in Science, and #Faculty = 1 are the reference groups for respective sets of independent variables. High univ tier: Univ tier = 3 or 4, Low univ tier: Univ tier = 1 or 2