NAME

Statistics::RatioVariance - Ratio and associated variance calculation.

SINOPSIS

my %zdNResults = RatioVariance->calc(\@x,\@y,\@x_var,\@y_var);

foreach my $key (keys %result){
print "$key = $result{$key}\n";

DESCRIPTION

For two vectors of means (X and Y) and its associated sets of variances (V[X] and V[Y]), this function calculates the rate (R) as:

R = sum(X)/sum(Y)

being sum(X) and sum(Y) the sum of all elements in the set, respectively. Also, it estimates the associated variance for R using Taylor expansion and taking into account the correlation between X and Y.

Furthermore, the function run a Z-Test to evaluate if R shifts from the unit significatively.

VERSION

Version 1.00

FUNCTIONS

calc

Launch the complete algorithm.

AUTHOR

Hector Valverde, <hvalverde at uma.es>

CONTRIBUTORS

Juan Carlos Aledo, <caledo@uma.es>

BUGS

Please report any bugs or feature requests to bug-statistics-ratiovariance at rt.cpan.org, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Statistics-RatioVariance. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.

SUPPORT

You can find documentation for this module with the perldoc command.

perldoc Statistics::RatioVariance

You can also look for information at:

• RT: CPAN's request tracker (report bugs here)

  http://rt.cpan.org/NoAuth/Bugs.html?Dist=Statistics-RatioVariance

• AnnoCPAN: Annotated CPAN documentation

  http://annocpan.org/dist/Statistics-RatioVariance

• CPAN Ratings

  http://cpanratings.perl.org/d/Statistics-RatioVariance

• Search CPAN

  http://search.cpan.org/dist/Statistics-RatioVariance/

LICENSE AND COPYRIGHT

Copyright 2012 Hector Valverde.

This program is free software; you can redistribute it and/or modify it under the terms of either: the GNU General Public License as published by the Free Software Foundation; or the Artistic License.

See http://dev.perl.org/licenses/ for more information.