Natural disaster information statistics study based on stratified random sampling survey statistical methods

Studying establish one method of Natural Disaster statistics based on stratified random sampling, designed a two-stage stratified random sampling framework to estimate the overall disaster of the provincial disaster process, given stratified random sampling calculation method, and estimated county samples by the village samples, and then estimated the provincial overall disaster situation by the county samples, given the calculation steps and procedures, and calculated the overall disaster of one flood disaster process which happened in 2011.