| Regression model hypothesis | Interpretation |
|---|---|
| H: β q2 - β q1 > 0 | Block repair is incomplete; not to good as new. |
| H: β q3 > 0 | The repair fraction of good as new is decreasing. |
| H: β q4 > 0 | The failure rate increases with the time since block repair. |
| H: β q5 > 0 | There is an accelerated failure rate with increasing time since repair. |