The American Journal of Gastroenterology · 2001 · 401 citations · 18 references
A brief, simple 12-item questionnaire demonstrated validity and reliability and seemed to be responsive to change for reflux and dyspeptic symptoms.
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The Measurement of Observer Agreement for Categorical Data
J. Richard Landis, Gary G. Koch · Biometrics · 1977 · 76.3K citations · Full text
Coefficient Alpha and the Internal Structure of Tests
Lee J. Cronbach · Psychometrika · 1951 · 42.3K citations · Full text
National Institute of Mental Health Diagnostic Interview Schedule
Lee N. Robins · Archives of General Psychiatry · 1981 · 5.3K citations
Mail and Telephone Surveys: The Total Design Method.
Marie Withers Osmond, Don A. Dillman · Social Forces · 1979 · 5.1K citations