Sustainable Energy Research

Table 5 Results of LPM estimation on switching to GSU water use

From: Household demand and supply for clean groundwater in the Mekong Delta, Vietnam

Explanatory variable		Coefficient	t -value	R ²	Number of observations
No interaction effect
Constant		0.853	5.028^***
Sex
Female		-	-
Male		0.053	1.746^*
Age
≤40 years		-	-
41 to 60 years		−0.118	−1.622^ns
≥61 years		−0.17	−1.869^*
Education
High school and above		-	-
Primary school		−0.098	−1.741^*
Secondary school		−0.057	−1.423^ns
Occupation
Other careers		-	-
Farmers		0.019	1.156^ns
Residence
1996 to 2005		-	-
≤1975		−0.181	−1.86^*
1976 to 1985		−0.1	−1.571^ns
1986 to 1995		0.025	1.743^*
Family number
≤3 persons		-	-
4 to 5 persons		0.041	1.591^ns
6 to 7 persons		0.039	1.906^*
≥8 persons		0.058	1.719^*
Income
≤2 million VND		-	-
2 to 5 million VND		−0.062	−2.256^**
>5 million VND		−0.195	−2.561^**
Interaction effect
Income	Year of taking up residence
2 to 5 million VND	≤1975	0.107	1.591^ns
2 to 5 million VND	1976 to 1985	−0.163	−1.649^*
2 to 5 million VND	1986 to 1995	−0.326	−2.151^**
>5 million VND	≤1975	0.106	1.344^ns
>5 million VND	1976 to 1985	0.092	1.356^ns
>5 million VND	1986 to 1995	−0.408	−2.986^***
				0.210
					233

Notes: ***, **, * indicate significance at 1%, 5%, and 10% levels, respectively; ns, not significant.

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