|
| (1) | (2) | (3) | (4) |
| VARIABLES | LP(劳动生产率) | LP | LP |
|
|
|
|
|
|
|
| ISO14001(t-1) | 89.47*** |
|
|
|
|
| (33.07) |
|
|
|
| ISO9001(t-1) |
| 33.22* |
|
|
|
|
| (19.44) |
|
|
|
|
|
|
|
|
| OHSAS(t-1) |
|
| 41.36 |
|
|
|
|
| (39.18) |
|
| IMS(t-1) |
|
|
| 1.789*** |
|
|
|
|
| (0.0490) |
| SIZE(t-1) | 0.762*** | 0.725*** | 0.845*** | 0.000168*** |
|
| (0.0528) | (0.0494) | (0.0493) | (6.18e-05) |
| | ||||
| Number of fnamenum | 949 | 988 | 1,004 | 869 |
Standard errors in parentheses
*** p<0.01, ** p<0.05, * p<0.1


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