作者: Ilene N. Bernstein , George W. Bohrnstedt , Edgar F. Borgatta
DOI: 10.1177/004912417500400106
关键词: Research methodology 、 Differential (mechanical device) 、 Psychology 、 Selection (genetic algorithm) 、 External validity 、 Situational ethics 、 Generalizability theory 、 Cognitive psychology 、 Research evaluation 、 Management science 、 Sociological research 、 Social Sciences (miscellaneous) 、 Sociology and Political Science
摘要: This paper delimits and explicates threats to external validity particularly problematic in evaluation research. Five categories of factors are discussed: selection effects, measurement confounded treatment situational effects due differential mortality. The focuses on pointing up specific ways which each the threaten generalizability possible solutions methodological problems presented.