The POWER Procedure
- Overview
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Getting Started
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Syntax
PROC POWER Statement LOGISTIC Statement MULTREG Statement ONECORR Statement ONESAMPLEFREQ Statement ONESAMPLEMEANS Statement ONEWAYANOVA Statement PAIREDFREQ Statement PAIREDMEANS Statement PLOT Statement TWOSAMPLEFREQ Statement TWOSAMPLEMEANS Statement TWOSAMPLESURVIVAL Statement TWOSAMPLEWILCOXON Statement
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Details
Overview of Power Concepts Summary of Analyses Specifying Value Lists in Analysis Statements Sample Size Adjustment Options Error and Information Output Displayed Output ODS Table Names Computational Resources Computational Methods and Formulas ODS Graphics ODS Styles Suitable for Use with PROC POWER
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Examples
One-Way ANOVA The Sawtooth Power Function in Proportion Analyses Simple AB/BA Crossover Designs Noninferiority Test with Lognormal Data Multiple Regression and Correlation Comparing Two Survival Curves Confidence Interval Precision Customizing Plots Binary Logistic Regression with Independent Predictors Wilcoxon-Mann-Whitney Test
- References
Grouped-Name-Lists
A grouped-name-list specifies multiple scenarios for names in two or more groups. The list can assume one of two general forms, a "crossed" version and a "matched" version.
Crossed Grouped-Name-Lists
The crossed version of a grouped name list consists of a series of name-lists (see the section Name-Lists), one representing each group, with groups separated by a vertical bar (|). The values for each group represent multiple scenarios for that group, and the scenarios for each individual group are crossed to produce the set of all scenarios for the analysis option. For example, you can specify the following six scenarios for the survival curves 
of two groups
 |
|||
 |
as follows:
GROUPSURVIVAL = "Curve A" "Curve B" | "Curve C" "Curve D"
"Curve E"
Matched Grouped-Name-Lists
The matched version of a grouped name list consists of a series of name lists, each enclosed in parentheses. Each list consists of a name for each group and represents a single scenario for the analysis option. Multiple scenarios for the analysis option are represented by multiple lists. For example, you can express the crossed grouped-name-list
GROUPSURVIVAL = "Curve A" "Curve B" | "Curve C" "Curve D"
"Curve E"
alternatively in a matched format:
GROUPSURVIVAL = ("Curve A" "Curve C")
("Curve A" "Curve D")
("Curve A" "Curve E")
("Curve B" "Curve C")
("Curve B" "Curve D")
("Curve B" "Curve E")
The matched version is particularly useful when you want to include only a subset of all combinations of individual group values. For example, you might want to pair "Curve A" only with "Curve C", and "Curve B" only with "Curve D" and "Curve E":
GROUPSURVIVAL = ("Curve A" "Curve C")
("Curve B" "Curve D")
("Curve B" "Curve E")