| Variable | Definition | Unit |
| Dependent Variable | ||
| yi | Response to willingness to pay | 1 = Yes 0 = No |
| WTP | willingness to pay | USD |
| Independent Variable | ||
| Gen | Gender | 1 = Male 0 = Female |
| Age | Age | Year |
| Occ | Occupation | 1 = Government staff 0 = Others |
| Edu | Education | Years |
| Stat | Status | 1 = Married 0 = Others |
| Eth | Ethnicity | 1 = Laoloum 0 = Others |
| HS | Household size | People |
| Tl | Years of living | Years |
| Mceo | Used to participate in elephant conservation | 1 = Used to 0 = Never |
| Inc | Household income per month | USD |
| Price | Price to pay for conservation | USD |
| #Math_2# : a constant parameter | ||
| #Math_3# : the coefficient of the bid variable | ||
| #Math_4# : error | ||