| 单词 | stratified sampling |
| 释义 | stratified sampling noun[U] MARKETINGukustheactivityofdividingalargegroupofpeopleintosmallergroupsbasedonage,sex,socialclass, etc. inordertofindout more about theopinionsof thewholegroup: Stratifiedsamplingcan be used when thepopulationissplitup intogroupswho arelikelytobehavedifferently. Examplesofstratified samplingstratified sampling A real-world example of usingstratifiedsamplingwould be for a political survey. From Wikipedia  This example is from Wikipedia and may be reused under a CC BY-SA license.Proportionatestratifiedsamplinginvolves selecting participants from each strata in proportions that match the general population. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.While it is usually best to sample randomly, concern with differences between specific subpopulations sometimes calls forstratifiedsampling. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Instratifiedsampling, the analysis is done on elements within strata. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Instratifiedsampling, a random sample is drawn from each of the strata, whereas in cluster sampling only the selected clusters are studied. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.There are many reasons to usestratifiedsampling: to decrease variances of sample estimates, to use partly non-random methods, or to study strata individually. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.The advantage ofstratifiedsamplingis that the sample numbers in each stratum can be controlled for desired accuracy outcomes. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.A solution to this problem is to use an alternate design strategy, e.g.stratifiedsampling. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Although cluster sampling andstratifiedsamplingbear some superficial similarities, they are substantially different. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.Clearlystratifiedsamplingalgorithm concentrates the points in the regions where the variation of the function is largest. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license.These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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