stratified sample


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stratified sample

n
(Statistics) statistics a sample that is not drawn at random from the whole population, but separately from a number of disjoint strata of the population in order to ensure a more representative sample. See also frame13
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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Noun1.stratified sample - the population is divided into strata and a random sample is taken from each stratum
statistics - a branch of applied mathematics concerned with the collection and interpretation of quantitative data and the use of probability theory to estimate population parameters
sample distribution, sampling, sample - items selected at random from a population and used to test hypotheses about the population
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References in periodicals archive ?
The results presented here are based upon a nationally representative, stratified sample of 4,601 adults (age 18 and older) and representative oversamples of the following subgroups: parents with school-age children living in their home (2,129), teachers (641), African Americans (624), and Hispanics (799).
Material and Methods: A stratified sample of 520 students, and 60 faculty members were invited to participate in this cross sectional study.
We refer to this technique as IP oversampling: Since in the stratification process some observations were oversampled, this method is a way of reoversampling underrepresented observations in the stratified sample. Since IP oversampling is applicable to arbitrary classifiers, we take it into account for further comparisons.
The survey of 2014 was conducted based on a stratified sample of students throughout the Kyrgyz Republic.
Of a stratified sample of 250 cases TIGTA reviewed.there was no evidence that employees completed all of the required research steps for 57 percent of the cases prior to their closurel.
Is there a difference in school-wide student pass rates on English/ Language Arts (ELA) assessments between an experimental group of elementary, middle, and secondary RAMP-designated schools (2007-2009) and a stratified sample of control schools at one particular point in time (2009)?
Nationwide studies of a stratified sample from the death registry of Statistics Netherlands were carried out in 1990, 1995, 2001 and 2010.
The poll was done by EVRESIS company between August 17 and 23 and consisted of a total of 1,287 telephone interviews on a random stratified sample basis.
The exception was British Columbia where a stratified sample with optimum allocation of effort was used (Hodges and others 1984).