Single-Factor Between Subjects ANCOVA

The hypotheses tested in the single-factor between-subjects ANCOVA are identical to those tested in the One-Way ANOVA. However, the means are adjusted for the effects of the covariate, i.e., the ANCOVA evaluates adjusted mean values.

Example
• If the measure of learning of three groups is compared while adjusted for the effect of intelligence, each group will have two columns of data, one storing the covariate (X) and one the dependent variable (Y). Hence, for three groups we will have a total of six variables. The variables should be placed in the same order, i.e., Group1 X, Group1 Y; Group2 X, Group2 Y; Group3 X, Group3 Y (see the data layout below).
  
• The output results are presented in table format and include variance on covariate, variance on dependent variable, analysis of covariance, and correlation coefficients.