You should be able to achieve what you want with BCMath for PHP. Take a 
look at this:

http://www.numbertheory.org/php/php.html
http://www.php.net/manual/en/ref.bc.php

regards,
Kupo

senechaux wrote:
> Hi, i'm looking for a library of PHP to calculate mathematical
> statistics like covariance, correlation, ...
> anybodoy can help me??
>
> Thanks
>
>
> >
>
>   


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