POLS 3650 Chapter Notes - Chapter 2: Nonprobability Sampling, Causal Inference, Sampling Bias
16 Jan 2017
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Document Summary
Measurement invalidity: validity is a fundamental property of any type of measurement it asks the simple question, Are we measuring what we think we are measuring : measurement validity situations in which you are really measuring what you think you are measuring. Having bad measures of concepts (e. g. , using police data on known offenses as a measure of the true extent of crime) is a major contributor to the. Major sources of sampling bias include the use of outdated or ordered lists from which the sample is drawn and non-response by survey respondents that is associated with particular characteristics of the sample elements. Telephone directories to draw public samples obvious problems is that telephone directories exclude: people without telephones, residents with unlisted phone numbers, recent movers. Independent variable the variable that causes of influences another variable. It is called the treatment variable in experimental designs.
