Table 2.
Equation | Design Characteristics |
---|---|
Y = a + bGroup + e (2) | 2 groups, 1 time point (no pretest) |
Y = a + b1Pretest + b2Group + e (5) | 2 groups, 2 time points (pretest and posttest) |
Y = a + b1Group1 + b2Group2 + e (7) | 3 or more groups, 1 time point, orthogonal a priori contrasts |
Y = a + b1Group + b2Time + b3Group*Time + e (8) | 2 groups, 3 or more time points, linear model |
Y = a + b1Group + b2Linear + b3Linear*Group + b4Quadratic + b5 Quadratic*Group + e (10) | 2 groups, 3 or more time points, non-linear model |
Y = a + b1Group + b2Sex + b3Group*Sex + e (11) | 2 groups, 1 time point, subject moderator (e.g., sex) |
Y = a + b1Group + b2Sex + b3Time +b4Group*Sex + b5Group*Time + b6Time*Sex + b7Group*Sex*Time + e (13) | 2 groups, 3 or more time points, subject moderator |
Note. Equation numbers are in parentheses following equations.