一级抽样单位 [统计] first stage sampling unit
一级抽样比 [统计] primary sampling fraction
分层一级抽样 stratified one stage sampling
一级抽样单元 single-stage sampling unit
一级抽样单元[位 single-stage sampling unit
分层一级整群抽样 stratified one stage cluster sampling
一级抽样
Primary sampling
以上为机器翻译结果，长、整句建议使用 人工翻译 。
目前的平衡两层次样本轮换模式只适用于一级单元规模较小时的两阶段抽样月度调查。
The present balanced two-layer sample rotation system is applicable only to the monthly survey with two-stage sample designs and with small primary sampling units.
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