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                         Announcing:
                       GAUSS Data Tool
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Aptech Systems, Inc., is pleased to announce several new products and
enhancements/extensions for the GAUSS Mathematical & Statistical
System (GAUSS). For more detailed information, please visit
www.Aptech.com or contact your local dealer.

GAUSS DATA TOOL
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GAUSS Data Tool is a stand-alone program for working with variables in
GAUSS data sets. Data Tool loads the columns of the data sets into a
workspace as vectors where they can be transformed or modified using
simple intuitive statements. Data sets can also be created by
simulation using a variety of models, e.g., probit, logit, GARCH,
linear. A new version of a data set can be generated where missing data
are replaced by single or multiple imputations from a maximum
likelihood estimation using the EM algorithm.

Variables can be copied from one data set to another. Data sets can be
merged on the basis of a keylist; i.e., one or more columns that
uniquely define the observations. They can be concatenated, sorted, or
added to. Variables can be dropped or kept, or modified in complex ways
using any of the GAUSS operators or functions, including its powerful
matrix operations.

Data Tool is customizable by adding your own functions for modifying
data. Hooks are described in the manual for adding your own procedures
for simulating data or handling missing data. For the Windows version,
a graphical user interface provides much of this capability in menus,
toolbars, and dialogues, as well as a command line interface that turns
data handling into a set of simple direct statements that make short
work of complex data problems.

Features Include:
---Handling missing data
---Create and simulate data sets
---Create new variables
---Delete observations
---Drop variables
---Keep variables and drop all others
---Execute GAUSS commands unfiltered
---List data sets
---List variable names and types
---Merge data sets on a key variable
---Select observations
---Sort data set
---Compute statistics on data set
---Simulate using various models, e.g., probit, logit, GARCH, linear
---Impute missing data using EM algorithm

Platforms:
Available for Windows, LINUX, AIX4, HPUX11 and Sun SPARC ﾊ ﾊ

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