I need credible data regarding false detection rates for some open source signature based network intrusion detection system.

I have been eyeing hogwash, but I can't seem to find any such data (and many pages regarding hogwash seem to be down which is never a good sign).

Please excuse my ignorance on this matter, I am not a network engineer, but I'd like to toss a few example COTS/Open Source IDS systems with a false detection rate of less than 1% into a proposal I am throwing together to point the engineers in the right direction.

If this is something real obvious I apologize, it is after three am and my brain has turned to tapioca trying to get this wrapped up. I don't actually need it until 5pm tomorrow, but I will have minimal time later.

Any answers before 4pm PST on May 13 would be greatly appreciated.
Thanks,

catch