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Selection of Work Sampling Observation Times: Part I—Stratified Sampling

Joseph J. Moder

Abstract

Various methods of selecting observation times in work sampling studies are presented, including simple random, systematic, and stratified sampling, and a new method called restricted random sampling. The attributes of these sampling methods are evaluated, particularly statistical efficiency, and the important advantages of stratification are demonstrated. Finally, the analysis of variance is recommended for statistical analysis of work sampling data to account for the presence of several sources of variation, in addition to sampling error.

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Key concepts: Stratified sampling, Sampling (signal processing), Simple random sample, Sampling design, Statistics, Systematic sampling, Slice sampling, Selection (genetic algorithm)