coefficient of variation tool?

[DOMIT]

I used to have StatKing on another pc that has since been fried... One thing that StatKing offered me was calculating my CV (coefficient of variation).

Does anyone know of a free tool that I can use to find this? (I keep all my session data in a db).

Thanks,
Glenn

PS: yes, I have tried searching, but haven't found anything (in fact when just searching on "coefficient", I did a find in the post to jump to the reference, and I was told the value was not found...[img]/images/graemlins/confused.gif[/img]).