PASS

Confidence Intervals - Means

PASS 2008 has six procedures that can be used to calculate the sample sizes necessary to achieve a specified distance from a given mean to the confidence limits at a stated confidence level for a confidence interval about the mean when the underlying data distribution is normal.

These procedures analyze confidence intervals for
    1. One Mean
    2. One Mean with Tolerance Probability
    3. Two Means
    4. Two Means with Tolerance Probability
    5. Paired Means
    6. Paired Means with Tolerance Probability

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PASS 2008

from PASS 2005:
$399.95 (commercial)
$349.95 (academic/government)

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

"Researchers seeking software to determine sample size have a wide range of choices... Researchers seeking a comprehensive, commercial program for analysis of statistical power and precision should consider PASS 2008."

- Patrick Dattalo
 “A Review of Software for Sample Size Determination”
Eval Health Prof, 2009.

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)

Upgrade Now

Read about what’s new in PASS 2008.

View the upgrade brochure.
View the PASS 2008 brochure.


PASS Training Course

A 4-week, online training course on using PASS is now being offered through statistics.com. The course is taught by Dr. Thomas P. Ryan. Click here for more information.


Download a
PASS Update

Most Recent PASS 2008 Update
Released January 14, 2010

Update

What problems have been fixed by recent PASS updates?


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


System Requirements
PASS 2008, NCSS 2007, and GESS 2006 run on 32-bit and 64-bit systems with Windows 7, Vista, XP, 2000, NT, ME, 98, or 95. Requires pentium-class computer 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. NCSS is one of the most accurate statistical analysis programs available. NCSS calculates with seventeen-digit, double-precision accuracy.

Guarantee
If you are not completely satisfied with an NCSS product during the first 30 days for any reason, return the program for a full, prompt refund (excluding shipping).

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