- Subject index
Bridging an understanding of Statistics and SPSS.
“The text is written in a user-friendly language and illustrates concepts that would otherwise be confusing to beginning students and those with limited computer skills.”
-Justice Mbizo, University of West Florida
This unique text helps students develop a conceptual understanding of a variety of statistical tests by linking the ideas learned in a statistics class from a traditional statistics textbook with the computational steps and output from SPSS. Each chapter begins with a student-friendly explanation of the concept behind each statistical test and how the test relates to that concept. The authors then walk through the steps to compute the test in SPSS and the output, clearly linking how the SPSS procedure and output connect back to the conceptual underpinnings of ...
Chapter 12: Analysis of Covariance
Analysis of Covariance
Conceptual Background of Analysis of Covariance (ANCOVA)
Having learned that ANOVA and regression are both instances of the general linear model, you may not be surprised to learn that they can be combined into a single analysis. This technique—the analysis of covariance, or ANCOVA—is perfectly suited for studies with both continuous and categorical independent variables. The conceptual model can be written literally as a combination of ANOVA and regression models:
where observation i within group j is described as the sum of group j‘s mean, plus person i‘s ...