Presentation on theme: "Recap of sampling…. Sampling example… A survey of 300 households is being conducted to assess exposure to violence- related shocks in an urban setting."— Presentation transcript:
Recap of sampling…
Sampling example… A survey of 300 households is being conducted to assess exposure to violence- related shocks in an urban setting in the US. To achieve the level of precision required (taking into account the finite population correction coefficient) we need to survey 100 households.
Simple random sampling Random number table What is the first step??? Using the random number tables below, what would be the first household sampled (by number)? How about the second, third and fourth?
Systematic sampling… What is the sampling fraction? Using the below random numbers table and the sampling fraction, what would be the first household sampled? How about the second, third and fourth? Random number table
Cluster sampling… We are doing a household survey in Zimbabwe. We are conducting a disproportionate sample by province. Sample size calculations (taking into account a design effect of 2) indicated that we needed to sample 900 households per province. We have decided to sample 30 clusters of 30 households. The total number of households in province 1 is 150,000. Given that we would like to maintain a 95% confidence level and we are assuming 0.50% prevalence, what is our precision in province 1? What is our precision in province 2? What is our sampling fraction for province 1? What is our first and second cluster number sampled in province 1?
no.Districtvillagenumber of HHs cumulativenumber of hhs 1Bayan-Ulgiitsagaannuur231 2Bayan-Ulgiinogoonnuur Bayan-Ulgiiulgii Bayan-Ulgiialtansogts Bayan-Ulgiibugat Bayan-Ulgiibayannuur Bayan-Ulgiitolbo Bayan-Ulgiideluun Bayan-Ulgiibulgan Uvsbukhmoron Uvsdavst Uvsulaangom Uvskhovd Uvsumnogobi Uvsulgii Uvserdeneburen khovd khovdmyangad khovdbuyat khovdjargalant khovddorgon khovdchandmana khovddarvi etc… 184dornodmatad Random number table