## table of contents

HYPEX(1) | HYPEX(1) |

# NAME¶

hypex - computes the Chernoff exponent between two simple categories.

# SYNOPSIS¶

**hypex** [-hH size] [-s stepsize] CATDUMP1 CATDUMP2

**hmine** -V

# DESCRIPTION¶

**hypex** reads two category dumps produced by dbacl(1) after
learning. A category dump is obtained using the **-d** and **-l**
switches, and is a textual representation of the feature weights which exist
in the binary category files.

Given two such category dumps for simple unigram categories,
**hypex** calculates the Kullback Leibler divergence between the
probability models, and prints out exponential error exponents for
Neyman-Pearson hypothesis tests under a range of threshold values. See
**Cover and Thomas (1991) Elements of Information Theory**, Chap. 12.

Note that only simple categories are supported, and the output only makes sense under appropriate theoretical conditions. This is a very specialized calculator.

# EXIT STATUS¶

**hypex** returns 0 on success, 1 if an error occurs.

# OPTIONS¶

# SOURCE¶

The source code for the latest version of this program is available at the following locations:

http://www.lbreyer.com/gpl.html

http://dbacl.sourceforge.net

# BUGS¶

Doesn't work with complex categories, and theoretical assumptions are unrealistic in practice.

# AUTHOR¶

Laird A. Breyer <laird@lbreyer.com>

# SEE ALSO¶

**dbacl**(1), **mailcross**(1), **mailfoot**(1),
**mailinspect**(1), **mailtoe**(1), regex(7)

Bayesian Classification Tools | Version 1.14.1 |