Ted Pedersen
and 1 contributors

NAME

USAGE How to use the Ngram Statistics Package (Text-NSP)

SYNOPSIS

Examples of how to use NSP.

DESCRIPTION

These are some sample usages of NSP. While this is not intended to be an exhaustive treatment of the various features, it should give you some idea of some of the ways you can use NSP.

GETTING HELP

 count.pl -help

 rank.pl -help

 statistic.pl -help

COUNT.PL

  • count all the bigrams in h.txt and store counts in holmes1.out

     count.pl h.cnt h.txt
  • count all bigrams that occur 5 or more times and store counts in holmes1.out5 AND create a histogram of the bigram counts and store in h-5.hist

     count.pl -frequency 5 -hist h-5.hist h-5.cnt h.txt
  • exclude all bigrams made up two words from stop.txt

     count.pl -stop stop.txt h-stop.cnt h.txt
  • count all bigrams that occur within a 4 word window AND use a stop list (this is especially useful to prevent bigrams caused by multiple occurrences of frequent words within the given window size (like 'and and' 'of of' etc.)

     count.pl -stop stop.txt -window 4 h-stop-w5.cnt h.txt

STATISTIC.PL

  • create a list of bigrams ranked by log-likelihood ratios. only allow scores of 6.00 or better among bigrams that occur more 3 or more times. (if you had used count to exclude certain frequencies you could simply use that file as input) (the .pm after the test name is optional)

     statistic.pl -score 6.00 -frequency 5 ll.pm holmes1.ll h.cnt
  • create a list of bigrams ranked by fisher's exact test (left sided) that only allow scores of 0.90 or better

     statistic.pl -score 0.90 leftFisher.pm h.fish h.cnt
  • create a list of the top 10 bigrams as ranked by the dice coefficient.

     statistic.pl -rank 10 dice.pm h.dice h.cnt
  • create a formatted report where bigrams are ranked by pointwise mutual information values, reported to 4 digits of precision.

     statistic.pl -format mi.pm -precision 4 h.report h.cnt

RANK.PL

  • compare the ranked list of bigrams created by pointwise mutual information and the log-likelihood ratio. make comparisons based on 3 digits of precision.

     rank.pl -precision 3 mi ll h.mi-ll-rank h.cnt
  • compare the ranked list of bigrams created by pointwise mutual information and the dice coefficient. make comparisons based on 5 digits of precision and compare only the top 10 bigrams selected by mutual information.

     rank.pl -precision 5 -rank 10 mi dice h.mi-dice-rank h.cnt
  • compare the ranked list of bigrams found by fisher's exact test and the dice coefficient. make comparisons based on 2 digits of precision and compare only those bigrams that score greater than 0.90 on fisher's exact test.

     rank.pl -precision 5 -score 0.90 leftFisher dice h.fish-dice-rank h.cnt

AUTHOR

Ted Pedersen, tpederse at d.umn.edu

BUGS

Last update on 02/15/01 by TDP based on BSP v0.3. This is very old, and should be updated to include many more examples of both command line use of NSP as well as module use.

SEE ALSO

 NSP home :    L<http://ngram.sourceforge.net> 

 NSP mailing list: L<http://groups.yahoo.com/group/ngram/>

COPYRIGHT

Copyright (C) 2000-2003 Ted Pedersen.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.

Note: a copy of the GNU Free Documentation License is available on the web at http://www.gnu.org/copyleft/fdl.html and is included in this distribution as FDL.txt.