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-   -   Anyone have Jan 1987 Stereo Review "Do All Amplifiers.." (http://www.diyaudio.com/forums/everything-else/119791-jan-1987-stereo-review-amplifiers.html)

Jakob2 22nd March 2008 06:14 PM

@ Janneman,

as SY pointed out- it could be significant.
Probability to get right answers by chance in these sort of tests is p=0.5 .
If a listener is right on every trial he reaches a probability of p=1 .

So, normally in the analysis we are looking for p>0.5, but if somebody is wrong on every sample he reaches a probability of p=0, and it maybe that he hears a difference in every trial but is unable to give the right answer.
Results like the one you´ve described should in every case get a further examination.

An interesting reading on this topic are Les Leventhals articles in the JAES. He creates the term `Statistical significant poor performance´ for these results.

But unfortunately his articles are a bit hard to read for the stastics challenged. :)
But i think well written so definetely worth a try.

Wishes

keyser 15th March 2012 11:55 AM

Bruce Coppola's site is down. Does anybody have the article?

gk7 15th March 2012 02:52 PM

I´ve found it here:
http://webpages.charter.net/fryguy/Amp_Sound.pdf

keyser 16th March 2012 08:37 AM

Thanks!


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