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| Analysis of Covariance | 1 |
| Data Interpretation | 1 |
| Graphs | 1 |
| Regression (Statistics) | 1 |
| Statistical Analysis | 1 |
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| Measurement and Evaluation in… | 1 |
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| Schafer, William D. | 1 |
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| Journal Articles | 1 |
| Opinion Papers | 1 |
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Peer reviewedSchafer, William D. – Measurement and Evaluation in Counseling and Development, 1992
Notes that presence of heterogeneous regression slopes in an analysis of covariance design is equivalent to presence of interaction in randomized-blocks design. Describes modification of the usual graphical representation of heterogeneous regressions that can aid in interpreting significant regions for regression surfaces. (NB)
Descriptors: Analysis of Covariance, Data Interpretation, Graphs, Regression (Statistics)
