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Sampling in Food Security Assessment

Sampling in Food Security Assessment. Kayw Zaw Tun Programme Assistant ( GIS) WFP. Probability sampling. Simple random sampling Systematic sampling Stratified sampling Cluster sampling Multi-stage sampling. Non-Probability sampling. Purposive sampling C onvenience sampling.

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Sampling in Food Security Assessment

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  1. Sampling in Food Security Assessment KaywZawTun ProgrammeAssistant (GIS) WFP

  2. Probability sampling • Simple random sampling • Systematic sampling • Stratified sampling • Cluster sampling • Multi-stage sampling Non-Probability sampling • Purposive sampling • Convenience sampling

  3. Stratified (random) sampling AA B BBB A A A A C CCC A A C CCC Divide the population into homogeneous sub-groups. Select sub-samples from each sub-group. (If one selects them in proportion to the size of the sub-group, the sample does need to be weighted later.) Maintains representation with small samples being even when the population is quite large. Ensures representation if the population is highly heterogeneous and some groups might be left out of the sample. Is cost-effective and time-saving.

  4. Resource flows = Livelihood activities Household food access Sources of food Expenditure Quantities retained for household’s own use Food purchases Food receipts Gathering Fishing Hunting Own production (food or cash crop, livestock, fish farm) Asset accumulation Non-essential expenditures Income used to purchase food Essential non-food expenditure Quantities sold to generate income Sources of income Sales Cash income Non-agric. production Trading Employment Cash receipts Debts incurred

  5. Landsat 7ETM + Land Cover Classification 2 Miles Buffer from Coastal Line Road Infrastructure Agriculture Land and Non-Agriculture Land Distribution of River and Stream Channel Zoning in NRS NRS Zones

  6. Sampling

  7. Systematic sampling A list of individuals/households is numbered. The list is divided into ‘n’ equal sections (‘n’ being sample size). One unit is selected using SRS. Corresponding numbers (one from each) are taken from each section (e.g. if the sixth unit is chosen from the first section, then it should be taken from all the other sections). It is possible to list the population in a meaningful manner (such as putting each county together) and thus ensure samples are taken from each county.

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  9. Thnak You

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