Determining Interactions and Regions of Significance for Curvilinear Regressions

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References

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Borich, G. D. and Wunderlich, K. W. Johnson-Neyman revisited: Determining interactions among group regressions and plotting regions of significance in the case of two groups, two predictors, and one criterion. EDUCATIONAL AND PSYCHOLOGICAL MEASUREMENT, 1973, 33, 155-159.

Johnson, P. O. and Neyman, J. Tests of certain linear hypotheses and their applications to some educational problems. Statistical Research Memoirs , 1936, 1, 57-93.

Wunderlich, K. W. and Borich, G. D. Curvilinear extensions to Johnson-Neyman regions of significance. Research and Development Center for Teacher Education, The University of Texas at Austin, 1973.