Item Response Theory
Item response theory (IRT) is an approach used for survey development, evaluation, and scoring. IRT models describe the relationship between a person's response to a survey question and his or her standing on a latent (i.e. unobservable) construct (e.g. math ability, depression severity, or fatigue level) being measured by multiple survey items. IRT modeling is used to (a) evaluate the psychometric properties of a survey, (b) test for measurement equivalence in responses to surveys administered across diverse populations, (c) link two or more surveys measuring similar domains on a common metric, and (d) develop tailored questionnaires that estimate a person's standing on a construct with the fewest number of questions. This entry discusses IRT model basics, the application of IRT to survey research, and obstacles ...
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Reader's Guide
Ethical Issues In Survey Research
Measurement - Interviewer
Measurement - Mode
Measurement - Questionnaire
Measurement - Respondent
Measurement - Miscellaneous
Nonresponse - Item-Level
Nonresponse - Outcome Codes And Rates
Nonresponse - Unit-Level
Operations - General
Operations - In-Person Surveys
Operations - Interviewer-Administered Surveys
Operations - Mall Surveys
Operations - Telephone Surveys
Political And Election Polling
Public Opinion
Sampling, Coverage, And Weighting
Survey Industry
Survey Statistics
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