stratified sample

(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

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Noun

stratified sample - the population is divided into strata and a random sample is taken from each stratum

proportional sample, representative sample

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).

METHODOLOGY

Material and Methods: A stratified sample of 520 students, and 60 faculty members were invited to participate in this cross sectional study.

PROPOSED SANCTIONS FOR PROFESSIONALISM LAPSES BY THE STUDENTS AND THE STAFF IN TWO PAKISTANI MEDICAL COLLEGES

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.

IRS may not be collecting all delinquent taxes

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)?

Comprehensive school counseling programs and student achievement outcomes: a comparative analysis of ramp versus non-ramp schools

Nationwide studies of a stratified sample from the death registry of Statistics Netherlands were carried out in 1990, 1995, 2001 and 2010.

Editor's comment: end-of-life practices in the Netherlands

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.

Cypriots other than AKEL members have little faith in austerity package

The exception was British Columbia where a stratified sample with optimum allocation of effort was used (Hodges and others 1984).

Bald Eagle population surveys of the North Pacific Ocean, 1967-2010

The program was implemented in grade K-2 classrooms in 17 schools, using a stratified sample of more than 8,000 students.

Students of teachers who received increased amounts of coaching from literacy coaches experienced greater learning gains, according to findings of a study developed by the Literacy Collaborative at Ohio State University