David Golden > Math-Random-OO-0.22 > Math::Random::OO::Bootstrap

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Module Version: 0.22   Source  

NAME ^

Math::Random::OO::Bootstrap - Generate random numbers with bootstrap resampling from a non-parametric distribution

VERSION ^

version 0.22

SYNOPSIS ^

  use Math::Random::OO::Bootstrap;
  @sample = qw( 2 3 3 4 4 5 5 6 6 7 );
  $prng = Math::Random::OO::Bootstrap->new(@sample);
  $prng->seed(42);
  $prng->next() # draws randomly from the sample

DESCRIPTION ^

This subclass of Math::Random::OO generates random numbers with bootstrap resampling (i.e. resampling with replacement) from a given set of observations. Each item in the sample array is drawn with equal probability.

METHODS ^

new

 $prng = Math::Random::OO::Bootstrap->new(@sample);
 $prng = Math::Random::OO::Bootstrap->new(\@sample);

new takes either a list or a reference to an array containing a set of observations and returns a new Math::Random::OO::Bootstrap object. If a reference is provided, the object will make an internal copy of the array to avoid unexpected results if the source reference is modified.

If the desired sample is an array of array references, the list must be enclosed in an anonymous array reference to avoid ambiguity.

 @sample = ( [ 1, 2, 3], [2, 3, 4] );

 # Correct way
 $prng = Math::Random::OO::Bootstrap->new( [ @sample ] );
 
 # Incorrect -- will only use [1, 2, 3] as the desired sample
 $prng = Math::Random::OO::Bootstrap->new( @sample );

It is an error to call new with no arguments.

seed

 $rv = $prng->seed( @seeds );

This method seeds the random number generator. At the moment, only the first seed value matters. It should be a positive integer.

next

 $rnd = $prng->next();

This method returns the next random number from the random number generator by resampling with replacement from the provided data. It does not take any parameters.

AUTHOR ^

David Golden <dagolden@cpan.org>

COPYRIGHT AND LICENSE ^

This software is Copyright (c) 2013 by David Golden.

This is free software, licensed under:

  The Apache License, Version 2.0, January 2004
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