User Guide

371
One-Way ANOVA
One-Way A NOV
A Post Hoc Tests
Figure 21-4
One-Way ANOVA Post Hoc Multiple Comparisons dialog box
Once you have determined that differences exist among the means, post hoc range
tests a
nd pairwise multiple comparisons can determine which means differ. Range
tests identify homogeneous subsets of means that are not different from each other.
Pairwise multiple comparisons test the difference between each pair of means, and
yield
a matrix where asterisks indicate significantly different group means at an
alpha level of 0.05.
Equal
Variances Assumed
Tukey
’s honestly significant difference test, Hochberg’s GT2, Gabriel, and Scheffé are
multiple comparison tests and range tests. Other available range tests are Tukey’s b,
S-N-K (Student-Newman-Keuls), Duncan, R-E-G-W F (Ryan-Einot-Gabriel-Welsch
F tes
t), R-E-G-W Q (Ryan-Einot-Gabriel-Welsch range test), and Waller-Duncan.
Available multiple comparison tests are Bonferroni, Tukey’s honestly significant
difference test, Sidak, Gabriel, Hochberg, Dunnett, Scheffé, and LSD (least
sign
ificant difference).