pèi é chōu yàng
配额抽样:(Quota Sampling)指调查人员将调查总体样本按一定标志分类或分层,确定各类单位的样本数额,在配额内任意抽选样本的抽样方式。
称定额抽样。先将总体按某些特征分成不同的类别,然后依据每一类中的个体占总体的比例来抽取相应数目的个体构成样本的方法。要求样本中个体的构成在指定的几个特征方面的比例与总体一样。配额抽样可以使样本有宏观上的代表性。例如市场调查中消费者的性别、年龄、收入、职业、文化程度等等。然后,按各个控制特性,分配样本数额。但它与分层抽样又有区别,分层抽样是按随机原则在层内抽选样本,而配额抽样则是由调查人员在配额内主观判断选定样本。
Say norm samples. First will overall divide into distinct category by certain feature, next according to each kinds medium individual occupy overall scale to come draw-out and corresponding numerary is individual the method that makes example. Form individually in requirement example the scale in respect of designation a few features and overall and same. Quota samples can make example has macroscopical those who go up is representative.
支链氨基酸(Branch Chain Amino Acid,Bcaa)简介:三种常见氨基酸的统称。...
关注 · 89支链淀粉(Amylopectin)简介:具有树枝形分支结构的多糖。...
关注 · 135山旮旯(faraway hilly area)简介:指偏僻的山区或院子里的角落。...
关注 · 187亲和力(Affinity)简介:比喻使人亲近、愿意接触的力量。...
关注 · 52鱼油(Fish Oil)简介:从多脂鱼类中提取的油脂。...
关注 · 121嘌呤核苷酸(Purine Nucleotide)简介:嘌呤核苷酸是一种嘌呤碱的核苷酸,五碳糖与有机碱合成核苷,核苷与磷酸合成核苷酸。...
关注 · 117配额抽样(Quota Sampling)简介:指调查人员将调查总体样本按一定标志分类或分层,确定各类单位的样本数额,在配额内任意抽选样本的抽样方式。...
关注 · 98乌蔹莓(Cayratia japonica)简介:一种中药材,葡萄科乌蔹莓属植物。...
关注 · 135