ABX P Value, Correct Equation |
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ABX P Value, Correct Equation |
 Sep 22 2004, 12:14
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#1
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 Group: Members Posts: 1018 Joined: 27-September 03 From: Cape Town Member No.: 9042  |
I definately remember reading a discussion on the correct calculation of the ABX p-value (probability you were guessing) a while back but a couple of searches and a read through the FAQ were unhelpful. From my limited stats knowledge (half a semester on probability) I came up with (for p correct from n trials) nCk*(0.5)^n*(0.5)^(n-k) which simplifies to nCk/2^n. This doesn't seem correct to me.
What is the correct equation for working this out? -------------------- Simulate your radar: http://www.brooker.co.za/fers/
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Sep 22 2004, 21:02
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#2
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 Group: Developer Posts: 432 Joined: 22-February 04 From: San Diego, CA Member No.: 12180 |
I don't know if there's an easier mathematical equation for it, but this one works:
n=number of trials k=number correct q=temp variable sum( q=0 to n-k : (nCq) / (2^n)) For n=5 and k=4, this gives 1/32 + 5/32 = 3/16 ~ 0.1875 [edit: deleted quote] This post has been edited by Omion: Sep 22 2004, 21:03 -------------------- "We demand rigidly defined areas of doubt and uncertainty!" - Vroomfondel, H2G2
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Sep 22 2004, 22:05
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#3
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 Group: Members Posts: 2525 Joined: 25-July 02 From: South Korea Member No.: 2782 |
-------------------- http://blacksun.ivyro.net/vorbis/vorbisfaq.htm
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Sep 23 2004, 07:40
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#4
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Group: Members Posts: 1018 Joined: 27-September 03 From: Cape Town Member No.: 9042 |
Thanks Omion and kjoonlee, that's just what I was looking for.
-------------------- Simulate your radar: http://www.brooker.co.za/fers/
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Lo-Fi Version | Time is now: 24th May 2013 - 22:48 |
