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Subjects were drawn from a probability proportionate to size sampling of primary schools throughout Ireland over the school year 2007 2008.
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The BRHP is a demographic surveillance site (DSS) that includes one semi-urban dwellers' association and nine rural peasant associations selected in 1986 from the Butajira district using a probability proportionate to size technique (20, 22).
A random sample of 1,105 primary schools was drawn on a probability proportionate to size sampling method (list obtained from the Department of Education and Skills website).
After studying the variety (type and age) of the conserved objects, we selected a probability proportionate to size sampling method.
Participating households were sampled by using a probability proportionate to size approach.
Out of 498 villages, 104 villages were selected according to a probability proportionate to size cluster sampling technique.
The DSS consists of nine rural and one urban kebeles sampled in 1986 using a probability proportionate to size technique.
In the first stage of sampling, 30 schools were selected with a probability proportionate to student population.
A probability proportionate to size sampling frame was adopted to capture the different rates of out-migration within the six districts.
Second, districts in each province were selected with a probability proportionate to number of employees, following which 15 schools and four hospitals within each of the selected districts were randomly selected.
In each province, we chose 25 clusters using a probability-proportionate-to-size method.
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