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Announcing NCSS 2001

New Procedures

• Cox Regression
• Crossvoer Design Analysis
• Cumulative Incidence Analysis
• Hotelling's T-Squared One and Two Groups
• If-Then Transformations
• Kaplan-Meier Curve
• Life Table Analysis
• Linear Regression
• Multinomial Logistic Regression
• Multiple Regression
• Poisson Regression

Hotelling's T-Squared

These procedures test for differences between vectors of means either one or two groups designs. The procedure includes a randomization test which allows you to obtain results when normality and equal variance assumptions are not net.

Logistic Regression

This new procedure adds automatic analysis of categorical variables and their interactions, hierachical variable subset selection, and the ability to analyze a dependent variable with more than two groups. It analyzes multiple group Y and categorical X variables. It provides extensive residual analysis including Pearson and Deviance residuals. It adds many plots to the output.

Cox Regression

Cox regression analyzes data in which the dependent variable is survival time. It's similar to regular multiple regression except that the dependent variable is the hazard rate which is calculated from the survival time. This procedure allows for categorical independent variables. It automatically generates powers and interactions of both numeric and categorical variables. It provides extensive residual analysis.

Poisson Regression

Poisson regression is similar to regular multiple regression except that the dependent variable is an observed count that follows the Poisson distribution. This procedure allows for categorical independent variables. It automatically generates powers and interactions of both numeric and categorical variables. It provides extensive residual analysis including Parson and Deviane residuals.

Linear Regression

The new linear regression procedure makes it easy to investigate the relationship between a dependent and one independent variable using the latest statistical technology. Included in the new procedure are bootstrap confidence intervals, confidence bands, randomization tests, and orthogonal regression(X & Y both random). Also included are several reports and graphs showing various diagnostics of the residuals.

Multiple Regression

This new Multiple regression procedure adds automatic analysis of categorical variables and their interactions, robust regression, and hierarchical variable subset selection as well as bootstrap confidence intervals.

Kaplan-Meier Curves

This new procedure computes Kaplan-Meier and Nelson-Aalen estimates of survival and associated hazard rates. It outputs various statistics and graphs that are useful in reliability and survival analysis. It also performs several log-rank tests and provides both the parametric and randomization test significance levels.

Life Table Analysis

A life-table presents the proportion surviving, the cumulative hazard function, and the hazard rates of a large group of subjects followed over time. The analysis accounts for subjects who die(fail) as well as subjects who are censored (withdrawn). The life-table method competes with the Kaplan-Meier product-limit method as a technique for survival analysis. For large samples, the life-table methods is still popular in that it provides a simple summary of a large set of data.

Cumulative incidence

Cumulative incidence is an extension of the Kaplan-Meier survival technique to the case when failure occurs for several reasons. This is sometimes called the problem of competing risks. Cumulative incidence analysis corrects major errors that can occur when failures due to other causes are treated as censored observations in a Kaplan-Meier analysis.

Cross-Over Design

This procedure analyzes data from a two-treatment, two-period(2X2) cross-over design using several t-test. The results of several equivalence tests are also displayed including Schuirmann's two one-sided confidence intervals.

If-Then Transformations

If-Then transformations are used to generate data when certain conditions are met. They are similar to regular transformations. However, there are two important differences. First, the transformation is only executed when the conditions are met. Second, the transformation does not reside with the database. Rather, it stays in the If-Then window.

Price and Ordering

The upgrade CD includes all new NCSS 2001 program and electronic version of user's documentation in a pdf file format for printing.

• $89.00 for NCSS 2000 owners
• $139.00 for NCSS 97,6.0,and 5.0. owners

The new printed user's documentation, User's Guide IV, is available for $50.00 if desired. Note that User's Guide I, II, & III are unchanged.

For Orders:

Print Order forms.

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