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

   -h

   -H     Same as dbacl(1). Selects the hash sizes in powers of two.

   -s     Stepsize  for  the  threshold.   hypex  outputs  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 <[email protected]>

SEE ALSO

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

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