Variables | Model II.1 (number of biogas plants BP) | Model II.2 (installed capacity IC) | ||
---|---|---|---|---|
Coefficient | Standard error | Coefficient | Standard error | |
Intercept | 13.56 | 16.56 | 12.35* | 4.96 |
Environmental–social–economic variables | ||||
ln(BPI) | 0.46** | 0.16 | − 0.21*** | 0.06 |
ln(AE) | 0.14 | 0.28 | 0.19• | 0.11 |
ln(DI) | − 0.20 | 1.92 | − 0.30 | 0.57 |
ln(GN) | 0.56* | 0.27 | 0.30*** | 0.07 |
ln(LP) | − 0.55** | 0.18 | 0.00 | 0.04 |
ln(\({\mathrm{PPAP}}_{t}\)) | − 3.68** | 1.16 | − 0.47 | 0.33 |
Control variables | ||||
City | − 0.93** | 0.29 | − 0.42* | 0.19 |
EEG dummy variables | ||||
\({\mathrm{EEG}}_{\mathrm{II}}\) | 1.40*** | 0.26 | 0.24** | 0.09 |
\({\mathrm{EEG}}_{\mathrm{III}}\) | 1.99*** | 0.40 | 0.05 | 0.12 |
\({\mathrm{EEG}}_{\mathrm{IV}}\) | 1.44** | 0.49 | − 0.12 | 0.15 |
Adjusted R2 | 0.25 | 0.10 | ||
Sample size | 700 | 1016 |