短語詞組短語disproportionate stratified random sampling 異比分層隨機抽樣proportional stratified random sampling 分層隨機抽樣stratified d sampling 分層抽樣品stratified random sampling method [統(tǒng)計]分層隨機抽樣法stratified cluster sampling 分層整群抽樣;采分層集束抽樣;抽樣法;整群分層抽樣proportionate stratified random sampling 定比分層抽樣法multistage stratified random sampling [統(tǒng)計]多級分層隨機抽樣stratified randomized sampling 隨機分層抽樣stratified random sampling surveys 分層隨機抽樣調(diào)查 返回 stratified sampling