PS102Lecture8

PS102Lecture8 - SamplingObservationsforStudy Political...

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Sampling Observations for Study Political Science 102 - Introduction to Political Inquiry – Lecture 8 Or…Who Cares about Sampling?
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Populations versus Samples A population is any well-defined set of units of analysis. The set of cases that we want to understand Determined by the research question A sample is a subset of a population. Selected from population by a systematic procedure: the sampling method. Sample statistics measure characteristics of the sample We use sample statistics to estimate the characteristics of a population Key logical inference is external validity
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Populations and Samples
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Some Terms and Definitions Population parameter Quantifiable characteristic of a population Denoted by capital English or Greek letter Sampling Frame Specific population from which sample is actually drawn Sample statistic Quantifiable characteristic of a sample Denoted with a small letter or a ^ Estimator Sample statistic that estimates a population parameter
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Populations and Samples We would like to analyze the population but cannot Large and impractical data collection Desire to generalize across time (and into future) Seek to produce a sample that matches population
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PS102Lecture8 - SamplingObservationsforStudy Political...

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