Secondary unit

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Secondary unit (SECONDARY unit)

Translation
Section	English 162	Arabic 162	Czech 162	German 162	Spanish 162	French 162	Italian 162	Japanese 162	Portuguese 162	Russian 162	Chinese 162
162-1	stratified random sampling	اعتيان الطبقي—اعتان الثراثحي	stratifikováný výběr	geschichtete Zufallsstichprobe	muestreo estratificado	sondage stratifié	sondaggio casuale stratificato	層別（化）無作為抽出法	amostra estratificada simples	Типологическая выборка —Стратифицированной случайной выборке	分层随机抽样
162-2	stratum	طبقات—شرائح	stratům	Schicht	estratos	strate	strati	層	estratos	Типы —Группы	层
162-3	multi-stage sampling	اعتيان المتعدد المراحل	vícestupňový výběr	mehrstufige Stichprobe	muestreo por etapas —muestreo polietápico	sondage à plusieurs degrés	sondaggio a più stadi	多段抽出法	amostragem de estágios múltiplos	Многоступенчатая выборка	多级抽样
162-4	primary unit	وحدات الأولى	primární jednotka	Auswahleinheit 1. Stufe	unidades primarias de muestreo	unité primaire	unità primarie	第一次単位	unidades de amostragem primárias	Первичные единицы	第一级抽样单位
162-5	sub-sample	عينة فرعية	podvýběr	Unterstichprobe	submuestra	sous-échantillon	subcampione	第二次標本	sub-amostras	Повторный выбор	分支样本
162-6	secondary unit	وحدات ثانوية	druhotná jednotka	Auswahleinheit 2. Stufe	unidades secundarias de muestreo	unité secondaire	unità secondarie	第二次単位	unidades de amostragem secundárias	Повторный отбор	第二级抽样单位
162-7	area sampling	اعتيان المساحي	výběr, oblastní	Flächenstichprobe	muestreo por áreas	sondage aréolaire	sondaggio per aree	地域抽出法	amostragem de área	Территориальная выборка	地区抽样

In stratified random sampling ¹ the population is divided into a number of strata ² which are in some sense more homogeneous (134-4) than the population as a whole with respect to the characteristics studied, and a simple random sample (161-4) is drawn in each stratum. Variable sampling fractions (161-5) may be used in the different strata. Multi-stage sampling ³ is a method where the selection of the sample is carried out in several stages. A sample of primary units ⁴ is first selected and each of these units is then regarded as a population (101-3) from which a sub-sample ⁵ of secondary units ⁶ is selected, and the process may be repeated. When there is no good sampling frame, a sample of areas delimited on a map may be selected: this procedure is called area sampling ⁷.