Stratified random sampling

Stratified random sampling (STRATIFIED random sampling)

Translation
Section	English 162	Arabic 162	Czech 162	German 162	Spanish 162	Finnish 162	French 162	Italien 162	[[pl-I:16#162\|Template:Lang name -pl 162]]	Portuguese 162	Russian 162
162-1	stratified random sampling	معاينة الطبقية العشوائية	stratifikovaný výběr	geschichtete Stichprobe	muestreo estratificado	ositettu otanta —stratifioitu otanta	sondage stratifié	sondaggio casuale stratificato	badanie reprezentacyjne warstwowe	AMOSTRAGEM estratificada simples	Типологическая выборка
162-2	stratum	طبقات	skupina prvků —stratum —stratum	Schicht	estratos	osite —stratum (yks.), strata (raon.)	strate	strato	warstwy (jednostek losowania)	ESTRATO	Типы —Группы изучаемой совокупности
162-3	multi-stage sampling	معاينة المتعددة المراحل	výběr vícestupňový	mehrstufige Stichprobe	muestreo polietápico	moniasteinen otanta	sondage à plusieurs degrés	sondaggio a più stadi	badanie reprezentacyjne wielostopniowe	AMOSTRAGEM em estágios múltiplos	Многоступенчатая выборка
162-4	sub-sample	عينة فرعية	podskupina	Unterstichprobe	submuestra	alanäyte —alaotos	sous-échantillon	subcampione	podpróba	SUB-AMOSTRA	Повторный выбор
162-5	area sampling	معاينة المساحية	výběr oblastní	Flächenstichprobe —Gebietsstichprobe	muestreo por áreas	alueotanta	sondage aréolaire	sondaggio per aree	badanie reprezentacyjne terytorialne	AMOSTRAGEM de áreas	Территориальная выборка

In stratified random sampling¹ the population is divided into a number of strata² which are in some sense more homogeneous than the population as a whole with respect to the characteristics studied, and a simple random sample (cf. 161-4) is drawn in each stratum. Variable sampling fractions (161-5) may be used in different strata. Multi-stage sampling³ is a method where the selection of the sample is carried out in several stages. A sample of primary sampling units (160-4) is first selected and each of these units is then regarded as a population from which a sub-sample⁴ is selected, and the process may be repeated. Where there is no good sampling frame, a sample of areas delimited on a map may be selected: this procedure is called area sampling⁵.
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