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Published byJocelin Harper Modified over 9 years ago
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Statistical Analysis of the Regression Point Displacement Design (RPD)
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Statistical Requirements
N(n=1) O X O N O O Pre-post Two groups, but one group has n=1 Dummy-code treatment variable Analysis of Covariance model
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RPD Example . 7 1 . 6 Y . 5 . 4 . 3 . 3 . 4 . 5 . 6 . 7 . 8 X
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Regression Model for Analysis of Covariance
yi = 0 + 1Xi + 2Zi + ei where: yi = outcome score for the ith unit 0 = coefficient for the intercept 1 = pretest coefficient 2 = mean difference for treatment Xi = covariate Zi = dummy variable for treatment (0 = control, 1= treatment[n=1]) ei = residual for the ith unit
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RPD Example The regression equation is Y = 0.0120 + 0.784 X - 0.0199 Z
Predictor Coef Stdev t-ratio p Constant X Z s = R-sq = 72.6% R-sq(adj) = 70.6%
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RPD Example . 7 1 . 6 Y . 5 2= . 4 . 3 . 3 . 4 . 5 . 6 . 7 . 8 X
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