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Difference between revisions of "Stratum"

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(Eugen Grebenik et al., first edition 1958)
(Eugen Grebenik et al., first edition 1958)
 
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TofT|Lang=it|Ed=I|N=2|Te=strato}}{{
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<noinclude>
 
<noinclude>
[[en-I:stratum]] [[ar-I:طبقات (طبقة)]] [[cs-I:skupina prvků]] [[de-I:Schicht]] [[es-I:estratos]] [[fi-I:osite]] [[fr-I:strate]] [[it-I:strato]] [[pl-I:warstwy (jednostek losowania)]] [[pt-I:ESTRATO]] [[ru-I:Типы]]  
+
[[en-I:stratum]] [[ar-I:طبقات]] [[cs-I:skupina prvků]] [[de-I:Schicht]] [[es-I:estratos]] [[fi-I:osite]] [[fr-I:strate]] [[it-I:strato]] [[pl-I:warstwy (jednostek losowania)]] [[pt-I:ESTRATO]] [[ru-I:Типы]]  
 
</noinclude>
 
</noinclude>
 
{{DEFAULTSORT:Stratum}}
 
{{DEFAULTSORT:Stratum}}

Latest revision as of 07:24, 11 February 2010

Stratum  (STRATUM)


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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