The negative coefficient of variables using Poisson logit and zero-truncated Poisson models
| Poisson model | Logit model | Zero-truncated Poisson model | ||||
|---|---|---|---|---|---|---|
| I | II | III | IV | V | VI | |
| Employee count | −0.0004* (0.0002) | −0.0007 (0.0038) | −0.001*** (0.0004) | −0.0006*** (0.0002) | 0.0023** (0.0011) | |
| Total journal citations | 0.0095*** (0.0009) | 0.0615*** (0.0085) | 0.0076*** (0.0009) | 0.0074*** (0.0009) | 0.0117*** (0.0025) | |
| Patent class | −0.0951 (0.3671) | 0.9160** (0.4627) | −0.5603* (0.3335) | −0.5524* (0.3337) | −0.1384 (0.0977) | |
| University collaborator | −0.6369*** (0.2332) | −0.1418 (0.7662) | −0.5949*** (0.2293) | −0.6024** (0.2364) | −0.4753*** (0.119232) | |
| Company collaborator | 0.0733 (0.2193) | 0.1692 (0.5857) | 0.0715 (0.2070) | 0.1883 (0.2057) | 0.2119 (0.2196) | |
| DOAJ journals | 0.0003*** (0.0001) | 0.0003 (0.0002) | 0.0003*** (0.000) | 0.0003*** (0.000) | 0.0002** (0.000) | |
| Constant | −0.0037 (0.3630) | n/a | 1.6508*** (0.1094) | 0.9750*** (0.3536) | 1.0785*** (0.3558) | n/a |
| Company FE | N | Y | N | N | N | Y |
| Prob > χ2 | 0.000 | 0.000 | 0.0035 | 0.000 | 0.000 | 0.000 |
| MacFadden adj R2 | 0.2406 | 0.0154 | 0.2218 | 0.2281 | ||
| Observations | 918 | 918 | 517 | 517 | 517 | 517 |
| Poisson model | Logit model | Zero-truncated Poisson model | ||||
|---|---|---|---|---|---|---|
| I | II | III | IV | V | VI | |
| Employee count | −0.0004* (0.0002) | −0.0007 (0.0038) | −0.001*** (0.0004) | −0.0006*** (0.0002) | 0.0023** (0.0011) | |
| Total journal citations | 0.0095*** (0.0009) | 0.0615*** (0.0085) | 0.0076*** (0.0009) | 0.0074*** (0.0009) | 0.0117*** (0.0025) | |
| Patent class | −0.0951 (0.3671) | 0.9160** (0.4627) | −0.5603* (0.3335) | −0.5524* (0.3337) | −0.1384 (0.0977) | |
| University collaborator | −0.6369*** (0.2332) | −0.1418 (0.7662) | −0.5949*** (0.2293) | −0.6024** (0.2364) | −0.4753*** (0.119232) | |
| Company collaborator | 0.0733 (0.2193) | 0.1692 (0.5857) | 0.0715 (0.2070) | 0.1883 (0.2057) | 0.2119 (0.2196) | |
| DOAJ journals | 0.0003*** (0.0001) | 0.0003 (0.0002) | 0.0003*** (0.000) | 0.0003*** (0.000) | 0.0002** (0.000) | |
| Constant | −0.0037 (0.3630) | n/a | 1.6508*** (0.1094) | 0.9750*** (0.3536) | 1.0785*** (0.3558) | n/a |
| Company FE | N | Y | N | N | N | Y |
| Prob > | 0.000 | 0.000 | 0.0035 | 0.000 | 0.000 | 0.000 |
| MacFadden adj | 0.2406 | 0.0154 | 0.2218 | 0.2281 | ||
| Observations | 918 | 918 | 517 | 517 | 517 | 517 |
Note(s): (robust) standard errors are in parentheses, ***p < 0.001, **p < 0.01 and *p < 0.05
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