求教，我看不懂这个结果的意思，有哪位好心人帮我解释一下，应该很简单的面板数据，多谢啦~
| | (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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