Results of the stationarity tests
| Variable | Absolute value | First-difference |
|---|---|---|
| Ranking | 8.4 | −0.1 |
| Sustainability courses | 8.0 | −3.8*** |
| Sustainability publications | 16.1 | −5.9*** |
| Citations | −4.6*** | −12.8*** |
| Sustainability spinoffs | −0.1 | −6.2*** |
| Green patents | −4.0*** | −6.0*** |
| Size | −9.5*** | −5.8*** |
| STEM-faculty ratio | 0.3 | −13.7*** |
| Tuition | −5.3*** | −9.4*** |
| Variable | Absolute value | First-difference |
|---|---|---|
| Ranking | 8.4 | −0.1 |
| Sustainability courses | 8.0 | −3.8 |
| Sustainability publications | 16.1 | −5.9 |
| Citations | −4.6 | −12.8 |
| Sustainability spinoffs | −0.1 | −6.2 |
| Green patents | −4.0 | −6.0 |
| Size | −9.5 | −5.8 |
| STEM-faculty ratio | 0.3 | −13.7 |
| Tuition | −5.3 | −9.4 |
This table reports the results of the Levin–Lin–Chu test for stationarity, which is conducted only on continuous variables. ***p < 0.01, **p < 0.05, *p < 0.1
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