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Table 5 Results of the multivariate regression for both Model II.1 and Model II.2

From: Effects of the German Renewable Energy Sources Act and environmental, social and economic factors on biogas plant adoption and agricultural land use change

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

  1. “***”, “**”, “*” and “•” denote 99.9%, 99%, 95% and 90% confidence levels, respectively