Stratified sampling of the schools based on ownership and province.
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Stratified sampling of the schools based on ownership and province.
依据办学属性与所属省份对学校开展分层抽样（Stratified sampling）
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2016-09-30
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Stratified sampling of the schools based on ownership and province.
依据办学属性与所属省份对学校开展分层抽样（Stratified sampling）