Statistical Analysis: Microsoft

11. Analysis of Variance: Further Issues

IN THIS CHAPTER

Factorial ANOVA 287

The Meaning of Interaction 293

The Problem of Unequal Group Sizes 300

Excel’s Functions and Tools: Limitations and Solutions 304

The sort of statistical analysis that Chapters 8 through 11 examine is called factorial analysis. The term factorial in this context has nothing to do with multiplying successively smaller integers (as Excel does with its FACT() function). In the terminology used by experimental design, a factor is a variable—often measured on a nominal scale—with two or more levels to which the experimental subjects belong.

For example, the research that was depicted in the previous chapter’s example and illustrated in Figure 10.11 is an experiment in ...