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偶遇抽样
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偶遇抽样
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accidental sampling
偶遇抽样
研究者根据实际情况,为方便开展工作,选择偶然遇到的人作为调查对象,或者仅选择离得最近、最容易找到的人作为调查对象,又称便利抽样。
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spring balance
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Spring Breeze
Spring Breeze Blows
Spring Breeze Reaches the Nuomin River
Spring Buds Project
spring buffalo dance
Spring Comes to A Shop Early
Spring Comes to Everywhere
spring comes to the lake
Spring Comes to the Withered Tree
spring compression testing machine
spring constant
spring cotton
spring drawing
Spring Dream in Old Capital
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spring equinox
Springer
Springer construction
Springer fibre
Springer Nature Group
Springer resolution
springer spaniel
Spring Exerciser
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