EXTERNAL VALIDITY AND EVALUATION RESEARCH - A CODIFICATION OF PROBLEMS (FROM VALIDITY ISSUES IN EVALUATIVE RESEARCH, 1976, BY I N BERNSTEIN - SEE NCJ-38442)

• NCJ Number: 38444
• Author(s): I N BERNSTEIN; G W BOHRNSTEDT; E F BORGATTA
• Date Published: 1976
• Length: 0 pages
• Corporate Author: Sage Publications, Inc
• Publication Format: Document
• Publication Type: Report (Study/Research)
• Language: English
• Country: United States of America

Annotation

THIS PAPER DELIMITS AND EXPLICATES THREATS TO EXTERNAL VALIDITY PARTICULARLY PROBLEMATIC IN EVALUATION RESEARCH.

Abstract

FIVE CATEGORIES OF FACTORS ARE DISCUSSED: SELECTION EFFECTS, MEASUREMENT EFFECTS, CONFOUNDED TREATMENT EFFECTS, SITUATIONAL EFFECTS, AND EFFECTS DUE TO DIFFERENTIAL MORTALITY. THE SPECIFIC WAYS IN WHICH EACH OF THESE FACTORS THREATEN GENERALIZABILITY ARE POINTED OUT AND POSSIBLE SOLUTIONS TO THE METHODOLOGICAL PROBLEMS ARE PRESENTED. REFERENCES ARE INCLUDED. (AUTHOR ABSTRACT)