The Fan-Spread Hypothesis and the Adjustment for Initial Differences Between Groups in Uncontrolled Studies.

Preece, Peter F. W.

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Peer reviewed

ERIC Number: EJ272077

Record Type: CIJE

Publication Date: 1982

Pages: N/A

Abstractor: N/A

ISBN: N/A

ISSN: N/A

EISSN: N/A

The Fan-Spread Hypothesis and the Adjustment for Initial Differences Between Groups in Uncontrolled Studies.

Preece, Peter F. W.

Educational and Psychological Measurement, v42 n3 p759-62 Fall 1982

The validity of various reliability-corrected procedures for adjusting for initial differences between groups in uncontrolled studies is established for subjects exhibiting linear fan-spread growth. The results are then extended to a nonlinear model of growth. (Author)

Descriptors: Achievement Gains, Analysis of Covariance, Error of Measurement, Hypothesis Testing, Mathematical Models, Pretests Posttests, Reliability, Research Design, Research Problems, Scores

Publication Type: Journal Articles; Reports - Evaluative

Education Level: N/A

Audience: N/A

Language: English

Sponsor: N/A

Authoring Institution: N/A

Grant or Contract Numbers: N/A

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