I am trying to model persistence in exporting on a sample of new firms using survival analysis techniques. I am tracking firms since inception (year=1). I am currently struggling with three issues:
- How to set the data correctly (see Table 1 below as an example of how my panel dataset currently looks like)
- How to treat
- new firms that never exported during the observation period (see e.g., firm 1 in Table 1 below)
- new firms that exported intermittently (see e.g., firm 4 in Table 1 below)
- How to model persistence in exporting
Giuseppe
Table 1
| firmid | year | exportdummy |
| 1 | 1 | 0 |
| 1 | 2 | 0 |
| 1 | 3 | 0 |
| 1 | 4 | 0 |
| 2 | 1 | 0 |
| 2 | 2 | 1 |
| 2 | 3 | 1 |
| 2 | 4 | 1 |
| 3 | 1 | 0 |
| 3 | 2 | 1 |
| 3 | 3 | 0 |
| 3 | 4 | 0 |
| 4 | 1 | 0 |
| 4 | 2 | 1 |
| 4 | 3 | 0 |
| 4 | 4 | 1 |
| 5 | 1 | 1 |
| 5 | 2 | 1 |
| 5 | 3 | 1 |
| 5 | 4 | 1 |
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