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# The Dubit

Unversal measurement of certainty/believability
 (0) [vote for, against]

I think it would be nice to quantify how believable (or, conversely, how questionable) a statement, idea, etc. is -- hence, the dubit. The more questionable something is, the more dubits -- something that is a known certainty (e.g. "You will die someday") would rate zero dubits.
 — bananafish, Jan 02 2003

What are the chances? http://www.halfbake..._20the_20chances_3f
related idea [krelnik, Oct 17 2004]

 something to ponder on, yes, mr/ms/miss banana.

I may rename my bullshit meter - my dubit meter.
 — po, Jan 02 2003

In Sweden I talked to Ms. Inger,
Who said her elbow to long finger
Was a unit called cubit.
Didn't doubt it a dubit,
Her arms were like Notre Dame's bell ringer.
 — FarmerJohn, Jan 02 2003

Then there was his twin brother Pseudomodo who fell to his death, a dead ringer.
 — FarmerJohn, Jan 02 2003

I don't think you can quantify a completely subjective estimation. It's all about how credulous the reader / listener is...
 — snarfyguy, Jan 02 2003

 I think a better conversion function is -log2(p). This has the advantage that if you're x dubious about A happening, and y dubious about B happening, then you're x+y dubious about both of them happening, which seems intuitively correct.

 Why log2 instead of ln? Because that way a dubit is basically a bit of information. "This fair coin will come up heads" rates exactly one dubit.

The concept is "baked" in information theory (handwavingly, if an event is 100% certain, then if it happens you get 0 bits of information; if an event is extremely unlikely, then knowing that it happened is a lot of information), though I'm not sure if I could come up with a single name that means the same thing. Possibly "bit of entropy".
 — egnor, Jan 02 2003

Dubya-it?
 — RayfordSteele, Jan 02 2003

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