منابع مشابه
Experimentation in the 21st Century: The Importance of External Validity
Much of the consumer behavior literature is devoted to what has been referred to as theory applications (TA) research in which the main focus is on laboratory experiments with student subjects and high internal validity. In this article, the author argues that external validity concerns should be given more attention, particularly in TA research. Three recommendations are made for implementing ...
متن کاملThe Importance of External Examinations
Every nation must select those who are certifi ed as graduating successfully from schooling and those who may proceed to a university. In some places, such as Vietnam, this is done in two stages with different examinations. In other places, such as in New Zealand, the credit units established in secondary school may be suffi cient to qualify for admission to a university. This book provides a c...
متن کاملWeighting for External Validity∗
External validity is a challenge in treatment effect estimation. Even in randomized trials, the experimental sample often differs from the population of interest. If participation decisions are explained by observed variables such differences can be overcome by reweighting. However, participation may depend on unobserved variables. Even in such cases, under a common support assumption there exi...
متن کاملTheory and External Validity
Winer (1999 [this issue]) proposes that external validity concerns require more attention in theoretical research. The author argues that one cannot “enhance” external validity by choosing one method over another. External validity can only be “assessed” by better understanding how the focal variables in one’s theory interact with moderator variables that are seen as irrelevant early in a resea...
متن کاملExternal, Internal and Construct Validity
Introduction In research, validity refers to the degree to which findings are applicable in real-life situations. Essentially, if the findings are strongly valid, it implies that they have an excellent degree of applicability. In contrast, low validity implies that the survey is not applicable in real-life situations. The specific approach used during research has strong influence on validity. ...
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ژورنال
عنوان ژورنال: American Journal of Public Health
سال: 2008
ISSN: 0090-0036,1541-0048
DOI: 10.2105/ajph.2007.126847