Features: Survival Analysis
Survival Analysis Options
Accrual- Prior to study
- Constant rate for a given number of intervals
- Varies from one interval to the next
- Constant for all study intervals
- Varies from one interval to the next, proportional
- Varies from one interval to the next, non-proportional
- None
- Constant rate
- Varies by time and/or by group
- Log Rank, Wilcoxin
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Includes the procedures you need
In addition to survival analysis, includes modules to compute power for means, proportions, analysis of variance and covariance, multiple linear regression, logistic regression, equivalence tests, and more.
PDF Manual and Help system
The PDF manual (300 pages) 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 step-by step instructions for each procedure.
Tools and Features
This guide alerts you to the program’s features and offers suggestions for increasing power.
Click “Find N” and the program displays the sample size required for any level of power. You may specify an allocation ratio (e.g., 2:1) and you may specify that the accrual rate should vary from one time interval to the next.
If the accrual rate varies simply specify the relative proportion of subjects to be entered during each interval (e.g. 1:1:2:2). When you click Find N the program computes and graphs the actual number to be entered during each interval.
"This is stunning in its clarity and efficiency."
Dr. Sal Mannuzza - New York University School of Medicine
Power and Precision
Power and Precision is a statistical power analysis software package for calculation of a sample size for a planned study. The program features an unusually clear interface, and many tools to assist the user in developing an understanding of power analysis.