How is QB Rating compiled?

[Sooner74]

I was just wondering how this statistic is compiled? I was looking through and comparing Sam Bradford's stats to the Tulsa's QB and Sam has:
More yards...Better completion percentage...less sacks...more touchdowns...and less interceptions. This has me really perplexed with the only difference being the # of passes, but does this make up for a 10 pt qb rating difference?

[PalmBeachSooner1]

http://www.primecomputing.com/formula.htm

[Sooner74]

Thanks Palm...That confirms what I might have thought. Less passes helps the Tulsa Qb.

[tommieharris91]

I still don't think the NCAA formula puts enough weight on INTs.

[JLEW1818]

I think there should be tipped interceptions, and interceptions.

Shoot how many picks does Sam actually have, where it's not tipped, or a hail Mary?

[Sooner74]

I agree Sam has had 3 tipped balls as interceptions. I think this stat needs some serious updating.