poisson distribution function?

[muppet77]

is it possible to calculate values in php using the poisson distribution?

 

I have searched for a function and also searched this forum.

 

I found stats_cdf_poisson but with not much help at http://php.net/manual/en/function.stats-cdf-poisson.php

 

I tried plugging in some numbers but i just got

Call to undefined function stats_cdf_poisson()

 

echo stats_cdf_poisson(10,10.1,1);

 

any ideas please?

 

I don't think that it can be mathematically calculated can it? In excel there is a nice function already set up.

 

Every web search seems to lead back to the link I posted above.

 

Thanks in advance!

 

 

 

[muppet77]

Ah, seen i need a library to make it work.

 

Do i need PECL stats and PEAR?

 

What do I do with them - just upload them to my host???

 

They are zipped files, but i'm not sure what to do next.

 

Any help please?

[ignace]

If you are using shared hosting then it will be unlikely for you to install them. You can try contacting the host provider and ask them if they could install the extension but it's also unlikely they will.

 

An other option you may have is finding the poisson distribution in pure PHP like:

http://www.phpmath.com/build02/PDL/docs/package.php?view=6c892fdf713fd5c15ff0cdd31daf79463531ceef

 

Which uses PEAR (quite likely to be installed on your host). A full index of pure PHP mathematical functions can be found at: http://www.phpmath.com/build02/