stratified sample [统计] 分层样本 ; 分层抽样 ; 分层取样 ; 分层样品

stratified random sample 分层随机样本 ; 分层随机抽样

stratified seam sample 分层煤样

non-stratified sample [统计] 非分层样本 ; 不分层样本

stratified rock sample 层状岩样

post stratified sample 事后分层抽样

stratified purposive sample 分层立意样本 ; 分层蓄意样本

disproportionate stratified sample 非比例的分层样本

randomly stratified sample 随机分层抽样

stratified cluster sample 分层整群抽样