One-way ANOVA Part 2

APA-Style Tables

It is common with ANOVA designs to report the means, standard deviations, and results of pairwise comparisons in a table. In general, use two decimal places (see APA Publication Manual, 6th edition, pages 113-114 for more on decimals). The box below shows a typical table for comparisons of three groups. The note underneath the table explains how subscripts are used to describe the results of the Tukey HSD comparisons. For more on formatting tables, see the APA Publication Manual, chapter 5.

Table 1

Means and Standard Deviations of Responses to How Enjoyable Tasks Were, by Condition
Control
One Dollar
Twenty Dollar
-0.45a
(2.31)
1.35b
(2.11)
-0.05ab
(1.85)

Note. Standard deviations are in parentheses. Means that do not share subscripts differ by p < .05 according to Tukey’s Honestly Significant Difference.

A tutorial for how to make an APA-style table in MS Word is here. A sample Google Doc with an APA-style table can be found here.

Some notes on tables:

  1. Every table must be numbered, and must be referred to in the text (e.g., "As the means in Table 1 indicate...").
  2. The title of a table is presented below the word "Table", double-spaced, and is capitalized.
  3. The subscripts presented next to the means can sometimes seem like a logic puzzle, so think through them carefully. In the table above, we show that the Control Condition is different from the One Dollar condition by giving them different subscripts, and we show that those two groups do not differ from the Twenty Dollar condition by giving the Twenty Dollar condition both subscripts. Fortunately, some of the SPSS output can be of help here:

How to Determine Subscripts

The homogeneous subsets output shows you groups of means that do not differ significantly from each other. To use that information to make the subscripts:

  1. give an "a" subscript to all the groups listed under Subset 1 (Control and Twenty Dollars) and
  2. a "b" to all the groups listed under Subset 2 (Twenty Dollars and One Dollar). Note that the Twenty Dollars condition will receive both an a and a b.

Homework

There is a homework assignment to help you practice using one-way ANOVA on the Moodle site.