Echantillonnage
Méthode d'échantillonnage
The sample of public school students is drawn using a four-stage stratified sampling design. Strata are formed by the cross-classification of regions and ecological belts (division of the country in 3 parts from north to south: Mountain; Hill, and Terai).
In the first stage, districts are selected within strata. In the second stage, Village Development Committees (VDC) are selected in each sampled district. In the third stage, schools are selected within sampled VDCs. For the first three stages, the sample was drawn with probability proportional to size (PPS). The size measure is the number of students in grades 2 and 3. In the fourth stage, 10 grade 2 students and 10 grade 3 students are randomly sampled in each selected school. If there were less than 10 students available in a grade, then all students in that grade were assessed.
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