Variable label

Definition

Measure

Dependent Variable

Y^*

Y^* is a single latent measure of respondents’ WTP for monthly additional environmental fee for wastewater treatment

1 = 50,000 VND

2 = 100,000 VND

3 = 130,000 VND

4 = 200,000 VND

Independent Variables

Relation

Relation to household head

1 = household head

0 = otherwise

Age

Age of respondent

Years

Gender

Gender of respondent

1 = Male

0 = Female

Edu

Educational level of household head

Years of schooling

Quan WW

Quantity of untreated wastewater

Cubic meters

Childs

Presence of children under 16 years old in the household

1 if household has at least one child, 0 otherwise

Number disease

Frequency of illness among household member

Number of times

Loginc

Logarit average monthly household income