Calculating Stat vs Att/M.Att (Prime Scrolls)

if you go beyond that, constants start to get annoying, there was a thread with a massive formula but i couldn't find it, best i could find was this.

http://www.southperry.net/showthread.php?t=54311

edit: if you have an INORDINATE amount of attack compared to int, then that ratio doesn't seem too far off really, i myself am somewhere around 2.5 to 1.