

Working With Results
Tables
 Print directly
 Copy to clipboard as data and insert into Microsoft Excel® or other spreadsheet New!
 Copy to clipboard as a bitmap and insert into Microsoft Word ® or other word processing program
Graphs
 Print directly
 Copy to clipboard as data and insert into Microsoft Word® or other word processing program
 Export as bitmap (BMP), Windows Metafile (WMF) or Windows enhanced Metafile (EMF) and insert into Microsoft Word®, PowerPoint® or other programs New!
Reports
 Save as RTF file or copy to clipboard and insert into Word ® or other word processing programs.
Stored Scenarios (Sensitivity analysis)
 Print directly
 Copy to clipboard as data and insert into Microsoft Excel® or other spreadsheet New!
 Copy to clipboard as a bitmap and insert into Microsoft Word® or other word processing program
Tables and graphs
 Pivot the tables interactively New!
 Display several graphs at once to assess the impact of factors in isolation or in combination with each other. New!
 Graphs are linked to the tables  Drag and drop columns in table, and the graphs are updated as well. New!
 Graphs can be saved as BMP, WMF, EMF files and easily exported to Word, PowerPoint, and other programs. New!
 Tabulate and graph precision (confidence interval) and standard error as well as power for proportions and means.
Tools and Features
 Find the sample size for a given level of power
 Assign subjects to groups using allocation ratio
 Store and restore any set of parameters
 Apply Cohen's effect size conventions
 Store scenarios to list (sensitivity analysis)
 Customize the spin control for sample size
 Customize data entry
 Set alpha and tails, link to confidence interval
 Customize the number of decimals displayed
 Display power using digits or bar graph
Statistical Procedures
ttests and ztests
 One group against a null of zero
 One group against a userspecified null
 Paired/change against a null of zero
 Paired/change against a userspecified null
 Two independent groups, enter difference score
 Two independent groups, enter mean for each group
Proportions
 One group against a null of 50%
 One group against a userspecified null
 Two independent groups (Eight computational options for power including Fisher exact test. Indices include risk difference, relative risk, and odds ratio).
 McNemar test of paired proportions
 KxC test of independent proportions*
 Sign tests
Correlations
 One group against a null of zero
 One group against a userspecified null*
 Two groups*
Analysis of variance/covariance
 One way analysis of variance/covariance
 Two way fixed effects factorial anova/ancova
 Three way fixed effects anova/ancova
Multiple hierarchical linear regression
 Templates for common designs including covariates followed by main effects; main effects followed by interactions; dummycoded variables; and polynomial regression
 Customize the design with up to 10 sets of variables and up to 99 variables per set
 Computes power for the increment to Rsquared at each step and also for the cumulative Rsquared at each step
 Compute power for sequential sets combined
Logistic regression* New!
 One continuous covariate
 Two continuous covariates, one partialled
 Two continuous covariates combined
 One categorical covariate up to 5 levels
Survival analysis* New!
 Accrual options  Prior to study, constant rate, or varies
 Hazard  Constant rate or varies
 Attrition (Dropouts)  None, constant rate, or varies
Equivalence tests New!
General Case
 Compute power using the noncentral t distribution, noncentral F, or noncentral chisquare distributions
Power, confidence intervals, tolerance intervals
 Compute power for all procedures
 Compute precision (expected width of confidence intervals) for ttests, ztests, one sample proportions, two independent sample proportions, and one sample correlation
 Compute tolerance intervals for ttests
Computational Algorithms
Includes exact algorithms for all procedures except where noted by (*).
Help and Technical Support
 Interactive guide
 Continuous summary
 Tip of the day
 Windows Help System including Table of Contents, Index, StepbyStep Help
 Technical support by email or phone
Printed manual
The printed manual explains the logic and proper application of power analysis.
It also includes worked examples for each statistical procedure, and details for all
algorithms An extensive Help system provides stepby step instructions for each procedure.
Developed by a Team of Experts
Michael Borenstein, Jacob Cohen, Hannah Rothstein, David Schoenfeld, Jesse Berlin, Ed Lakatos
Technical
Requires Windows® 95/98/Me/2000 or NT 4.0 and SVGA (800x600) screen.
™Windows, Word, PowerPoint and Excel are trademarks of Microsoft Corporation.
