Skip to main content

Strata

Encyclopedia
Edited by: Published: 2008
+- LessMore information
Download PDF

Strata in stratified sampling are distinct subsets of all entries on a sampling frame. These subsets are strategically defined by one or more stratification variables to improve the statistical quality of findings for the population as a whole or for important population subgroups. Once strata are formed and the sample is allocated among strata, stratified sampling is accomplished by randomly selecting a sample within each stratum.

Sampling strata may be formed explicitly from a list of population members or as a part of the selection process in individual stages of a cluster sample. Strata may also be considered "implicit" when the frame is sorted by variables that could otherwise define strata, and sampling is done in each of a set of groups of neighboring entries throughout ...

Looks like you do not have access to this content.

Reader's Guide

  • All
  • A
  • B
  • C
  • D
  • E
  • F
  • G
  • H
  • I
  • J
  • K
  • L
  • M
  • N
  • O
  • P
  • Q
  • R
  • S
  • T
  • U
  • V
  • W
  • X
  • Y
  • Z