Provided by: dbacl_1.12-2.1_amd64

**NAME**

hypex - computes the Chernoff exponent between two simple categories.

**SYNOPSIS**

hypex[-hH size] [-s stepsize] CATDUMP1 CATDUMP2hmine-V

**DESCRIPTION**

hypexreads two category dumps produced by dbacl(1) after learning. A category dump is obtained using the-dand-lswitches, 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,hypexcalculates 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. SeeCoverandThomas(1991)ElementsofInformationTheory, 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**

hypexreturns 0 on success, 1 if an error occurs.

**OPTIONS**

-h -H Same as dbacl(1). Selects the hash sizes in powers of two. -s Stepsize for the threshold.hypexoutputs exponents for different values of the threshold, within an interval bounded by the Kullback Leibler divergences between the categories. -V Print the program version number and exit.

**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)