Table 2.
Summary Statistics of Stayers and Movers: Peers Measures
| Stayers | Movers | Difference | |||
|---|---|---|---|---|---|
| Mean | Std. Dev. | Mean | Std. Dev. | ||
| Collaborators, Number | |||||
| Nb. of Peers, Colocated | 5.459 | 6.048 | 3.054 | 4.101 | 2.405*** |
| Nb. of Peers, Close | 1.164 | 2.304 | 0.736 | 1.847 | 0.428*** |
| Nb. of Peers, Distant | 11.524 | 10.303 | 12.892 | 11.604 | −1.368*** |
| Non-collaborating Peers, Number | |||||
| Nb. of Peers, Colocated | 3.221 | 4.027 | 2.489 | 3.556 | 0.732*** |
| Nb. of Peers, Close | 4.229 | 6.629 | 3.377 | 6.225 | 0.853*** |
| Nb. of Peers, Distant | 118.394 | 85.812 | 104.308 | 76.467 | 14.085*** |
| Collaborators’ Productivity | |||||
| Pubs, Colocated | 19.988 | 28.272 | 10.481 | 18.487 | 9.507*** |
| Pubs, Close | 4.057 | 10.492 | 2.337 | 6.840 | 1.721*** |
| Pubs, Distant | 46.480 | 57.592 | 47.791 | 56.480 | −1.311 |
| Non-collaborating Peers Prod. | |||||
| Pubs, Colocated | 12.652 | 20.260 | 9.395 | 17.995 | 3.257*** |
| Pubs, Close | 14.295 | 26.154 | 11.073 | 23.284 | 3.221*** |
| Pubs, Distant | 398.866 | 300.081 | 332.168 | 261.033 | 66.698*** |
| Observations | 6,584 | 3,467 | |||
Notes: The numbers presented in this table are based on the final year the scientist appears in the dataset. See section IIIB for more information about the measures of the peer environment and the sources of data. We identify movers by extracting information on institutions from biographical records and then calculate geographic distance between the zip codes of the institutions. The stayers include scientists who do not move or only move locally (within 50 miles). We limit our empirical attention to transitions that are at least 50 miles apart to ensure that the career transition led the scientists to change their place of residence. Stars in the last column indicate the results of tests of proportions and t-tests for the equality of means
* p < 0.10
** p < 0.05
p < 0.01.