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Nonresponse rate.
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The fraction of nonresponders in a survey: the number of nonresponders divided by the number of people invited to participate (the number sent questionnaires, the number of interview attempts, etc.) if the nonresponse rate is appreciable, the survey suffe
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Nonresponse, английский
In surveys, it is rare that everyone who is ``invited`` to participate (everyone whose phone number is called, everyone who is mailed a questionnaire, everyone an interviewer tries to stop on the street…) in fact responds. the difference between the "invited" sample sought, and that obtained, is the nonresponse.
Nonresponse bias, английский
In a survey, those who respond may differ from those who do not, in ways that are related to the effect one is trying to measure. for example, a telephone survey of how many hours people work is likely to miss people who are working late, and are therefore not at home to answer the phone. when that happens, the survey may suffer from nonresponse bias. nonresponse bias makes the result of a survey differ systematically from the truth.
Nonresponse bias., английский
In a survey, those who respond may differ from those who do not, in ways that are related to the effect one is trying to measure. for example, a telephone survey of how many hours people work is likely to miss people who are working late, and are therefor
Nonresponse rate, английский
The fraction of nonresponders in a survey: the number of nonresponders divided by the number of people invited to participate (the number sent questionnaires, the number of interview attempts, etc.) if the nonresponse rate is appreciable, the survey suffer from large nonresponse bias.
Nonresponse., английский
Participate, английский
Appreciable, английский
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Geometric distribution., английский
The geometric distribution describes the number of trials up to and including the first success, in independent trials with the same probability of success. the geometric distribution depends only on the single parameter p, the probability of success in e
Expectation, expected value., английский
The expected value of a random variable is the long-term limiting average of its values in independent repeated experiments. the expected value of the random variable x is denoted ex or e(x). for a discrete random variable (one that has a countable number
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