10_06+Sampling+2+-+Ch7

10_06+Sampling+2+-+Ch7 - 1 Sociology SYA4300 Professor Rob...

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Unformatted text preview: 1 Sociology SYA4300 Professor Rob White Thursday (10/06) Sampling Methods (Part 1) 1 ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ 2 Why Draw a Sample? 1. There is variation in the things that we study. 2. We cannot sample the entire population! • It’s too costly. • It takes too long. Period effects may occur during the period of data collection which change responses. ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ 3 Defining the Population of Interest Population : the complete enumeration of all elements in a closed system. 1. Which population (closed system) are we theorizing about? 2. Two defining features of the population: • Geographic location • Time period ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ 4 Defining the Population of Interest Sample Frame : the set of all cases from which the sample is actually selected. • This is an operational definition of the population. • The sample frame provides the information from which a sample is drawn. Problem: The sample frame often does not cover the entire population. 1. Migration 2. Target population may be rare (e.g. HIV+) 3. Target population may not want to be found (e.g., criminals) 4. There may be elements in the frame which are not in the target population (“ineligibles”)....
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This note was uploaded on 10/17/2011 for the course SYA 4300 taught by Professor Staff during the Fall '08 term at University of Florida.

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10_06+Sampling+2+-+Ch7 - 1 Sociology SYA4300 Professor Rob...

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