3. Methods and data
3.1. Sample and data
In Vietnam our survey focuses on Son La province.6 Here, in
2007/2008, we interviewed the same households that had previously
been interviewed as part ofthe Vietnamese Household Living
Standard Survey (VHLSS)(2004).According to the General Statistics
Office (GSO) in Hanoi, these household are a representative sample
of households in Son La province, drawn using a three-stage random
sampling procedure. The sample was drawn from each district