Soc_5_Sampling_Oct_16_2007

Soc_5_Sampling_Oct_16_2007 - Sampling: Who Do We Interview?...

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Sampling: Who Do We Interview? Sociology 5 October 16, 2007 Professor Irene Bloemraad
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Census vs. Samples ¾ census – total population count ¾ sample – selecting a limited number of respondents (or observations) to represent a larger population ¾ population – the total group of elements of interest in a study (e.g., a specific group of people, families, organizations, countries)
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When Do You Do a Census? When you are studying a small, identifiable population. – E.g., all students asked to do class evaluations When mandated by law. – US Census: Article 1, Section 2 of US Constitution, for apportionment of House When you have LOTS of money. – 2000 Census tally and related stats - $6 billion
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Bias in Census Counts bias – measurement errors that result in systematic misrepresentation of data in a particular direction ¾ bias in a census o Undercount o Non-response errors o Overcount
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When Do You Use Sampling? • When you want to draw conclusions about a large population in a quick and efficient manner by using a smaller number of cases.
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A Brief History of Sampling • “President Landon” - the Literary Digest poll • George Gallup and the 1948 election ¾ selection bias – choosing a sample in such a way that it does not accurately represent a larger population • E.g. “call-in” opinion polls on TV
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This note was uploaded on 09/22/2008 for the course SOC 5 taught by Professor Bloemraad during the Spring '07 term at University of California, Berkeley.

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Soc_5_Sampling_Oct_16_2007 - Sampling: Who Do We Interview?...

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