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Diffusion effects: Control group contamination threats to the validity of teacher-administered interventions

Abstract:

Within-class experimental designs (with experimental and control groups in the same classroom) are subject to diffusion effects whereby both experimental and control students benefit from the intervention, thereby contaminating the control group and biasing evaluations of intervention effects. Although the problem has been recognized, most previous demonstrations have been anecdotal. In support of diffusion effects, we show that a classroom intervention resulted in higher academic self-concep...

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Publication status:
Published

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Publisher copy:
10.1037//0022-0663.93.3.639

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Institution:
University of Oxford
Division:
SSD
Department:
Education
Role:
Author
Journal:
JOURNAL OF EDUCATIONAL PSYCHOLOGY
Volume:
93
Issue:
3
Pages:
639-645
Publication date:
2001-09-01
DOI:
ISSN:
0022-0663
Source identifiers:
103278
Language:
English
Pubs id:
pubs:103278
UUID:
uuid:ac51ed19-a881-4f62-ba52-21416e9d214a
Local pid:
pubs:103278
Deposit date:
2012-12-19

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