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Sampling/Mapping & Working with Central Statistical Offices

Sampling/Mapping & Working with Central Statistical Offices. Allen Hightower Associate Director for Informatics CDC Kenya. What are the rules?. In some countries, ALL surveys are required to be coordinated by the CSO! Final databases MUST be turned over to the CSO

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Sampling/Mapping & Working with Central Statistical Offices

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  1. Sampling/Mapping & Working with Central Statistical Offices Allen Hightower Associate Director for Informatics CDC Kenya RBM-MERG Malaria Indicator Training Workshop, 9th-12th September 2008, Lusaka, Zambia

  2. What are the rules? • In some countries, ALL surveys are required to be coordinated by the CSO! • Final databases MUST be turned over to the CSO • Any report from the survey, MUST be approved by CSO. • The CSO usually wants to be able to replicate any table. • The CSO may be the publisher of the official report • You may pay RBM-MERG Malaria Indicator Training Workshop, 9th-12th September 2008, Lusaka, Zambia

  3. How does the CSO normally do business? • Do they use the CSpro system for data management? • How will they put your survey data into their system? • Do they use SPSS, Crystal Reports, ….to produce reports? • What can you do make their job easier? If they cannot reproduce your work or demand to produce the report, that will cause delays. • Do they prefer to receive data in certain database formats (SPSS, STATA, etc. RBM-MERG Malaria Indicator Training Workshop, 9th-12th September 2008, Lusaka, Zambia

  4. How does the CSO normally do business?Part 2 • Will the data be archived? • Public access? • Web access? • What are their requirements for data dictionaries and other documentation? • Do they have a data warehouse? • Do they require the databases to be in a certain format? • Advice: Be as cooperative as possible to avoid delays. RBM-MERG Malaria Indicator Training Workshop, 9th-12th September 2008, Lusaka, Zambia

  5. How does your CSO create their samples? • Many have a sampling frame that they used for all sample surveys. • The sampling frame was often created for DHS surveys • Often a PPS subsample of EAs for the country. • Often there are 5000 EAs or so in the sampling frame • This might be 20% of the EAs in the country. • Then, for other surveys, they select a systematic or simple random sample from their sampling frame. • This preserves the PPS nature of their sample. RBM-MERG Malaria Indicator Training Workshop, 9th-12th September 2008, Lusaka, Zambia

  6. How does your CSO create their samples? • The sampling frame has its own sampling structure: • In Kenya: Rural/Urban/SES within Urban RBM-MERG Malaria Indicator Training Workshop, 9th-12th September 2008, Lusaka, Zambia

  7. Why do I care how my sample is chosen? • It limits the flexibility of what samples can actually be chosen. • But, it does have its pluses for most national scope surveys. • It will not work at all for some surveys • MICS surveys: need to have lots of sampled clusters in small geographic areas • You may have to develop your own sampling frame for some surveys. • The CSO can still provide field assistance. RBM-MERG Malaria Indicator Training Workshop, 9th-12th September 2008, Lusaka, Zambia

  8. Sampling frame development • Usually starts with census. • Organized by administrative areas • Choose sample down to lowest admin level possible • Subdivide and sample chosen areas (LGAs or sublocations). RBM-MERG Malaria Indicator Training Workshop, 9th-12th September 2008, Lusaka, Zambia

  9. Why would I want to use the CSO sampling frame? • The CSO usually maintains maps of the EAs in the sampling frame, but does not on other EAs. • These maps may not be up to date (why?), but are useful for setting boundaries for use of GPS Survey. • GPS Survey to be discussed in next Slide Set • The field personnel usually know the chiefs/elders of the EAs in the sampling frame. • Bottom line: developing your own sampling frame takes more time, costs more money, involves more risks. RBM-MERG Malaria Indicator Training Workshop, 9th-12th September 2008, Lusaka, Zambia

  10. What else can the CSO do for me? • The CSO usually maintains maps of the EAs in the sampling frame. • They are not free. • Their field personnel usually know the chiefs/elders of the EAs in the sampling frame. • Good idea to hire both CSO field personnel AND a local elder as guides. • Have to pay per diem/lodging costs for CSO field staff. • They may charge for choosing the sample from their sampling frame. RBM-MERG Malaria Indicator Training Workshop, 9th-12th September 2008, Lusaka, Zambia

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