APPENDIX A2
Analysis of Covariance (ANCOVS)
Analysis of variance deals with the influence of manipulated variables on the dependent variables in an experimental situation. It is a technique that combines the features of analysis of variance and regression. For example, a typical analysis of variance model for the value Yij of the jth observation in the ith class is,
Where
ui = |
the population means of the classes, and |
eij = |
the residuals. Now, suppose variable Xij is linearly related to Yij, it is better to remove the possible sources of variance in the criterion variable that may be attributable to factors not being controlled by the ... |
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