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A double proportion sampling technique was used using EPI6 stat-calc.
Proportion sampling was adopted to obtain the number of villages from each of the three study districts.
A disproportionate stratified sampling was used with oversampling of older people, and equal proportion sampling of the three main ethnic groups of Chinese, Malays and Indians.
The frequency of sequence sampling (Table 1, Additional file 1: Figure S1) in NA exhibits a winter seasonal pattern, while representative global sequences reflect our equal proportion sampling.
For the sampling of "other" global sequences (OT), equal proportion sampling in every month for every geographic location was used with the objective of capturing a sufficient representation of the underlying global genetic diversity.
Using stratified proportion sampling in a sample of 958 older adults >60 years living in an urban area in Brazil, Pegorari and Santos Taveres 20 found that depressive symptomatology was associated with frailty (OR =1.80; 95% CI =1.04 3.12), but not pre-frailty (OR =1.07; 95% CI =0.71 1.61); however, cognitive decline was an exclusion criteria in this study in contrast to the former two studies.
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The proportion sampled for this study was 0.18 (equal to 500/2,778).
Total numbers of drug stores, shinshes and kiosks in Surabaya were not available, making it impossible to calculate the proportion sampled for these retailers.
Table 3 Sampling frame Category Population Equally distributed amongst Kenya Power and Kengen Sample proportion Sample size Directors 10 100 10 Managers 20 100 20 Chief finance officer 30 100 30 Total 60 60.
The results obtained reveal that 0.35 m3/kg of biogas is produced with 8 2 weight proportion sample, which generates 26.8 kW h power from 35 kg of waste.
The study employed single population proportion sample size determination formula.
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