NAME

Statistics::Welford - Standard statistics using Welford's algorithm

SYNOPSIS

  my $stat = Statistics::Welford->new;

  while (1) {
        $stat->add(rand);
        ...
  }

  print $stat->mean;

DESCRIPTION

Standard statistics using Welford's algorithm

METHODS

new

  my $stat = Statistics::Welford->new;

The new constructor lets you create a new Statistics::Welford object.

add

Add an entry to the statistics base

n

Returns the number of entries to the statistics base

min

Returns the minimum number in the statistics base

max

Returns the maximum number in the statistics base

mean

Returns the mean value

variance

Returns the variance value

standard_deviation

Returns the standard deviation value

AUTHOR

Kaare Rasmussen <kaare@cpan.org>.

COPYRIGHT

Copyright (C) 2010, Kaare Rasmussen

This module is free software; you can redistribute it or modify it under the same terms as Perl itself.