UI CSS 506 - Sampling techniques (2 pages)

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Sampling techniques



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Sampling techniques

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Pages:
2
School:
University of Idaho
Course:
Css 506 - Fundamentals of Research

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Sampling techniques Advantages and disadvantages Techniqu e Simple random Descriptions Advantages Disadvantages Random sample from whole population Highly representative if all subjects participate the ideal Stratified random Random sample from identifiable groups strata subgroups etc Cluster Random samples of successive clusters of subjects e g by institution until small groups are chosen as units Stage Combination of cluster randomly selecting clusters and random or stratified random sampling of individuals Purposive Hand pick subjects on the basis of specific characteristics Can ensure that specific groups are represented even proportionally in the sample s e g by gender by selecting individuals from strata list Possible to select randomly when no single list of population members exists but local lists do data collected on groups may avoid introduction of confounding by isolating members Can make up probability sample by random at stages and within groups possible to select random sample when population lists are very localized Ensures balance of group sizes when multiple groups are to be selected Not possible without complete list of population members potentially uneconomical to achieve can be disruptive to isolate members from a group time scale may be too long data sample could change More complex requires greater effort than simple random strata must be carefully defined Quota Select individuals as they come to fill a quota by characteristics proportional to populations Ensures selection of adequate numbers of subjects with appropriate characteristics Clusters in a level must be equivalent and some natural ones are not for essential characteristics e g geographic numbers equal but unemployment rates differ Complex combines limitations of cluster and stratified random sampling Samples are not easily defensible as being representative of populations due to potential subjectivity of researcher Not possible to prove that the sample is representative of



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