Variable

Definition

Mean

Std. Dev.

Min

Max

Edu

Years of education (numbers)

10.97

4.80

0

20

Ratiomf

Ratio of male to female

1.22

0.75

0

4

Lnlncome

Logarithm of gross income (thousand VND)

19.079

0.617

17.3990

20.7233

Fpayelect

Feel that the paid money for electricity households’ consumption monthly is (very much = 5; much = 4; normal = 3; little = 2; very little = 1)

3.29

0.73

0

5

Votepes

Dummy variable of vote for payment for environmental services (yes = 1; no = 0)

0.77

0.41

0

1

Wtpl

Lower bound of the WTP interval

16,327

30,372

0

200,000

Wtpu

Upper bound of WTP interval

31,279

46,020

5,000

250,000

Midwtp

Midpoint of the WTP interval

23,803

38,042

2,500

225,000

Lnwtpl

Logarithm of the lower bound of the WTP interval

4.339

5.042

0

12.206

Lnwtpu

Logarithm of the upper bound of WTP interval

9.45

1.25

8.51

12.42

Lnmidwtp

Logarithm of the midpoint of WTP interval

8.94

1.45

7.8240

13.3847