6.2 The Stratification Principle STAT 506 - Sampling Theory and Methods

# 6.2 The Stratification Principle STAT 506 - Sampling Theory and Methods

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STAT 506 - Sampling Theory and Methods ANGEL Department of Statistics Eberly College of Science Home // Lesson 6: Stratified Sampling 6.2 The Stratification Principle Submitted by gfj100 on Tue, 12/01/2009 - 09:48 Unit Summary stratification principle optimal allocation of sample size examples The Stratification Principle If your only objective of stratification is to produce estimators with small variances, then we want to stratify such that within each stratum, the units are as similar as possible. In a survey of human population, stratification may be based on socioeconomic factors or geographic regions. For example, to estimate the average starting income for recent Penn State graduates, it would make sense to stratify by department since the starting income for graduates of the same department would be similar. Allocation in Stratified Random Sampling The question is, given a total sample size of n , how do we allocate these among L strata? Think About It!

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6.2 The Stratification Principle STAT 506 - Sampling Theory and Methods

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