Table 4 Definition, assignment, and descriptive statistics of variables
Variable | Definition and assignment | Mean | St. dev | Min | Max | VIF |
|---|---|---|---|---|---|---|
Cooking clean energy use decision | Energy choices for cooking: traditional solid energy = 0; clean energy = 1 (electricity = 1; gas = 2) | 0.89 | 0.789 | 0 | 2 |  |
Heating clean energy use decision | Energy choices for heating: traditional solid energy = 0; clean energy = 1 (electricity = 1; gas = 2) | 0.33 | 0.598 | 0 | 2 |  |
Hot water clean energy use decision | Energy choices for producing hot water: traditional solid energy = 0; clean energy = 1 (electricity = 1; gas = 2; solar energy = 3) | 1.50 | 1.238 | 0 | 3 |  |
Income growth | Growth rate of per capita annual household income: level 1 = 1,000; level 2 = 2,000; level 3 = 3,000; level 4 = 4,000; level 5 = 5,000 | 2500.00 | 1,707.952 | 0 | 5,000 | 1.000 |
Subsidy growth | Growth rate of government energy subsidies: level 1 = 600; level 2 = 1,000; level 3 = 1,500; level 4 = 2,000; level 5 = 2,400 | 1250.00 | 816.047 | 0 | 2,400 | 1.000 |
Gender | Respondent's gender: male = 1; Female = 0 | 0.58 | 0.494 | 0 | 1 | 1.026 |
Age | Respondent age: ≤ 18 = 1; 18–40 = 2; 40–60 = 3; ≥ 60 = 4 | 3.07 | 0.671 | 2 | 4 | 1.249 |
Education | Educational level of respondents: junior high school and below = 1; high school = 2; university = 3; postgraduate and above = 4 | 1.18 | 0.463 | 1 | 4 | 1.140 |
Family size | Number of individuals living at home all year round | 3.49 | 1.620 | 1 | 10 | 1.216 |
Income type | Respondents’ sources of household income: purely agricultural (farming and animal husbandry / low income insurance / relying on child allowance / pension) = 1; part-time (purely agricultural + income from self-employment / salary of teachers, cadres and other regular employees, etc.) = 2; non-agricultural (income from self-employment + salary of teachers, cadres and other regular employees, etc.) = 3 | 2.02 | 0.788 | 1 | 3 | 1.218 |
Income-level | Total household income last year: ≤ 10,000 = 1; 10,000–30,000 = 2; 30,000–50,000 = 4; 50,000–100,000 = 4; ≥ 100,000 = 5 | 2.66 | 1.051 | 1 | 5 | 1.402 |
Time dummy variable (based on 2021) | 2022 = 1, other = 0 | 0.87 | 0.34 | 0 | 1 | 1.388 |
Area dummy variables (based on rural areas in ecol. fragile areas of the Loess Plateau) | Rural areas in ecol. fragile areas of arid desert areas of Northwest China = 1, other = 0 | 0.29 | 0.455 | 0 | 1 | 1.520 |
Rural areas in ecol. fragile areas of the Qinghai-Tibet Plateau = 1, other = 0 | 0.28 | 0.449 | 0 | 1 | 1.745 |