YemenIn July 2015, WFP Yemen started remote phone-based data collection and food security monitoring in Yemen using the mobile Vulnerability Analysis and Mapping (mVAM) approach. Survey respondents are contacted monthly through a call centre and asked to respond to a short series of questions on household food consumption, negative coping strategies, and the food security situation in their communities. The findings are weighted by the number of SIM cards held by households and the population estimates for Internally Displaced Persons (IDPs) and non-IDPs in order to adjust for biases in the sample selection.

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