Estimation Method
The JMP does not collect primary data itself. Instead, to the extent possible, it exclusively uses data from primary sources such as censuses and national household surveys that are conducted by national statistical authorities every few years. These surveys include the UNICEF-supported Multiple Indicator Cluster Surveys (MICS) and the USAID funded Demographic and Health Surveys (DHS). One of the challenges faced by the JMP is that the definitions for an improved water source and improved sanitation are not consistent across countries. Another challenge is that censuses and surveys are only conducted every few years. The JMP thus uses linear regression to estimate data for a given year in a particular country even if no survey or census was carried out in that year, in order to be able to compare data across countries for the given year.
Read more about this topic: Joint Monitoring Programme For Water Supply And Sanitation
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