Power Analysis of Two Proportions

PASS
Equivalence Tests of Two Independent Proportions

An equivalence test is used to assess whether one proportion is equivalent to another. Four equivalence modules are available that compute power and sample size in two-sample designs in which the outcome is binary and the input parameters are stated in terms of proportions, differences in proportions, ratios of proportions, and odds ratios. The test statistics used are the likelihood score tests by Miettinen-Nurminen, Farrington-Manning, and Gart-Nam. Exact power calculations use the binomial distribution.

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PASS 2008 Upgrade Available
from PASS 2005:
$349.95 (academic/gov)
$399.95 (commercial)

from Earlier Versions:
$449.95 (academic/gov)
$499.95 (commercial)

We are pleased to announce the availability of PASS 2008. This edition adds over 40 new procedures and features to PASS.

New Procedures
Mixed Models
Logrank (Survival) Tests
Logrank Non-Inferiority Tests
Randomization Lists
Kappa Test for Agreement
CI - Means (6 Procedures)
CI - Proportions (2 Procedures)
CI - Regression Slope
CI - SD/Variance
(8 Procedures)
CI - Correlation
Microarray One-Sample/Paired
T-Tests
Microarray Two-Sample
T-Tests
Proportion Trend Tests
Normality Tests
TAD - Two Means
TAD - Two Proportions
Design of Experiments
(9 Procedures)

New Features
Simplified Interface
Improved Help System
Quick Launch
Macros (Programmability)

Read about what’s new in PASS 2008.

View the upgrade brochure.
View the PASS 2008 brochure.

Download a PASS Update
Current Version:
PASS 2008
Released May 13, 2008

What's changed in this release?

Sample PASS Procedures & Reports

Click here for the complete list.

Equivalence
Logrank (Survival) Tests
Means - 1 or 2 Groups (T-tests)
Means - Confidence Intervals
Means - Correlated or Paired
Means - Cross-Over Designs
Means - Many (ANOVA)
Mixed Models
Non-Inferiority
Probability Calculator
Proportion - 1 Group
Proportions - 2 Groups
Proportions - Confidence Intervals
Proportions - Correlated or Paired
Proportions - Many Groups
Randomization Lists
Regression/Correlation
ROC Curves
Special Calculators
Survival Analysis
Variances

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System Requirements
Runs under Windows Vista, XP, 2000, NT, ME, 98, 95 compatible Pentium-class computers with at least 32 MB of RAM. Requires 200 MB of hard disk space. Requires Adobe Reader® version 7 or later to use the NCSS, PASS, and GESS Help Systems.

Accuracy
We at NCSS have put a great deal of effort into finding the most accurate algorithms possible. The programs have been tested and verified over and over, both by us and by our customers. Each routine has been verified against textbooks, journal articles, and, where possible, other software. This verification is given in the documentation. PASS calculates with seventeen-digit, double-precision accuracy.

Guarantee
If you are not completely satisfied with PASS during the first 30 days for any reason, return the program for a full, prompt refund (excluding shipping)--no questions asked.