Basic Analysis and Graphing - SAS

134 Performing Oneway Analysis Chapter 5
Oneway Platform Options
Table 5.2 Descriptions of Oneway Analysis Platform Options (Continued)
t test
Analysis of Means Methods
Compare Means
Nonparametric
Unequal Variances
Equivalence Test
Power
Set a Level
Produces a t-test report assuming that the variances are not
equal. See “The t-test Report” on page 140.
This option appears only if the X factor has two levels.
Provides four commands for performing Analysis of Means
(ANOM) procedures. There are commands for comparing both
means and variances. See “Analysis of Means Methods” on
page 144.
Provides multiple-comparison methods for comparing sets of
group means. See “Compare Means” on page 146.
Provides nonparametric comparisons of group means. See
“Nonparametric” on page 151.
Performs four tests for equality of group variances. Also gives
the Welch test, which is an ANOVA test for comparing means
when the variances within groups are not equal. See “Unequal
Variances” on page 156.
Tests that a difference is less than a threshold value. See
“Equivalence Test” on page 158.
Provides calculations of statistical power and other details about
a given hypothesis test. See “Power” on page 159.
The Power Details window and reports also appear within the
Fit Model platform. For further discussion and examples of
power calculations, see the Modeling and Multivariate Methods
book.
You can select an option from the most common alpha levels or
specify any level with the Other selection. Changing the alpha
level results in the following actions:
• recalculates confidence limits
• adjusts the mean diamonds on the plot (if they are showing)
• modifies the upper and lower confidence level values in
reports
• changes the critical number and comparison circles for all
Compare Means reports
• changes the critical number for all Nonparametric Multiple
Comparison reports