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| Least Squares Statistics | 1 |
| Mathematical Models | 1 |
| Multiple Regression Analysis | 1 |
| Quasiexperimental Design | 1 |
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| Wasik, John L. | 1 |
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| Journal Articles | 1 |
| Reports - Evaluative | 1 |
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Peer reviewedWasik, John L. – Educational and Psychological Measurement, 1981
The use of segmented polynomial models is explained. Examples of design matrices of dummy variables are given for the least squares analyses of time series and discontinuity quasi-experimental research designs. Linear combinations of dummy variable vectors appear to provide tests of effects in the two quasi-experimental designs. (Author/BW)
Descriptors: Least Squares Statistics, Mathematical Models, Multiple Regression Analysis, Quasiexperimental Design
