chapter 10 - Representative Samples A sample is some pull...

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Representative Samples A sample is some pull or draw of observations from the population of observations. A biased sample does not represent the population and will give you inaccurate results.
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Sources of Bias Selection Bias: process used to collect the data produces unrepresentative sample Self-Selection Bias: individuals can sort themselves in and out of sample Survivorship Bias: some observations drop out skewing the remaining sample Positive Findings Bias: results win out.
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Time Value of Money Future Value of Money FV=PV(1 + r)n Present Value of Money PV=FV/(1 + r)n Why does this matter? Policy analysts have to project the benefits or costs of a project into the future or translate future benefits into today dollars.
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Sampling: the process of selecting a set of individual obs. from some larger population with the intent of making inferences. Samples from everyday life:
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This note was uploaded on 11/16/2011 for the course POLI SCI 2070 taught by Professor Davis during the Fall '11 term at LSU.

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chapter 10 - Representative Samples A sample is some pull...

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