AudioBanter.com - View Single Post - science vs. pseudo-science

(Audio Guy) wrote in message news:XWldb.603104$o%2.282900@sccrnsc02...
In article O36db.436378$Oz4.243723@rwcrnsc54,
(ludovic mirabel) writes:
(Audio Guy) wrote in message news:MpFcb.576680$YN5.411073@sccrnsc01...
In article ,
(ludovic mirabel) writes:

Below find the results of of Greenhill's ABX cable test (The
Stereophile ,1983)
A "hit" is 12 correct answers out of 15.
Note different performers, performing differently. (Surprise,
Surprise!).
Note Nr. 6; 1.75db level difference but music is the signal. Compare
with test
1 and test 4.
I will not rediscuss the "statistics". This was thrashed out ad
nauseam here.
If it tells you something different from what it tells me, well and
good.

SUBJECTS: A B C D E F G H I J K
Test1: Monster vs. 24 g. wire,Pink noise 1.75db level difference
15 14 15 15 15 15 15 15 15 15 15
2. Same but levels matched
9 13 7 10 na. 8 9 6 14 12 12
3. Monster vs. 16 gauge zipcord, Pink noise
13 7 10 7 11 12 9 9 11 12 7
4.. 16 ga vs. 24 ga., Pink noise
15 15 na. 14 15 na 15 14 15 15 15
5. Monster vs. 16ga., choral music
4 6 11 8 9 5 5 7 6 10 10
6. Monster vs. 24ga, choral music 1.75db. level difference
14 7 15 10 8 10 6 10 11 12 10
______________________________________________
% of "hits" in the total of 6 tests, 90 tries.
67. 50 40 33 40 40 33 33 50 83 50

L.M.:

It tells me that people can easy tell level differences with pink
noise, not so easily with music. Where does it "gives as many
different results as there are people doing it"?

You're right. I got sort of dozed off looking at it all and got
carried away.
It is sometimes 10/11 the same results sometimes 3/11 and a few in
between.
It all adds up beautifully. I wish you and Mr Nunes who "has just done
that" many happy hours with the ABX and pink noise.

This just shows again that you have an incomplete understanding of
statistics. You state that a hit is 12 out of 15. If it is not a hit,
then it is considered to be within the realm of random chance and so
is not counted any differently whether it is 1 out of 15 or 11 out of
15. That does not by any stretch of the imagination "gives as many
different results as there are people doing it".

I said I will not discuss satististics but I'm always eager to
learn. You are right.
It is all the same. No differences. Or maybe there are SOME
differences but they are not statistical. They are just an illusion, a
puff in the wind, a knock and we are through the mirror in the
Wonderland.

Ludovic Mirabel