Methods With stratified random sampling 100 from 1000 township health centers finished their buildings projects,to measure the change of availability with DEA.

• 方法:采用分层随机抽样方法,从河南省的1000个“乡镇卫生院建设”项目单位中抽取100个为样本,运用数据包络分析(DEA)方法测算项目单位在项目前后的数据包络分析(DEA)有效率变化。