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Preece, Peter F. W.	1
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The Fan-Spread Hypothesis and the Adjustment for Initial Differences Between Groups in Uncontrolled Studies.

Peer reviewed

Preece, Peter F. W. – Educational and Psychological Measurement, 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

Getting Straight: Everything You Always Wanted to Know about the Title I Regression Model and Curvilinearity.

Echternacht, Gary; Swinton, Spencer – 1979

Title I evaluations using the RMC Model C design depend for their interpretation on the assumption that the regression of posttest on pretest is linear across the cut score level when there is no treatment; but there are many instances where nonlinearities may occur. If one applies the analysis of covariance, or model C analysis, large errors may…

Descriptors: Achievement Gains, Analysis of Covariance, Educational Assessment, Elementary Secondary Education