Report

WINETASTER ON 02/04/08 WITH 6 JUDGES AND 8 WINES BASED ON RANKS, IDENT=N
Copyright (c) 1995-2008 Richard E. Quandt, V. 1.65

A Tasting of Recent Cortons

FLIGHT 1:
Number of Judges = 6
Number of Wines = 8

Identification of the Wine: The judges' overall ranking:

Wine A is Bressandes (Prince Florent) 2005 ........ 2nd place
Wine B is (Toillot-Beaut) 1995 ........ 6th place
Wine C is Bressandes (Lucien de Moine) 2003 tied for 3rd place
Wine D is Renardes (Girardin) 1998 ........ 5th place
Wine E is Bressandes (Prince Florent) 2002 ........ 1st place
Wine F is Clos du Roi (Vougeraie) 2002 ........ 7th place
Wine G is Clos du Roi (Chandon de Briailles) 2003 ........ 8th place
Wine H is Clos du Roi (Girardin) 1997 tied for 3rd place

The Judges's Rankings

Judge Wine -> A B C D E F G H

Orley 1. 3. 7. 8. 2. 4. 6. 5.
Ed 5. 7. 1. 8. 4. 3. 2. 6.
Burt 4. 3. 6. 1. 2. 5. 8. 7.
Bob 3. 6. 4. 2. 5. 7. 8. 1.
John 4. 5. 3. 7. 2. 8. 6. 1.
Dick 5. 6. 3. 2. 1. 7. 8. 4.

Table of Votes Against

Wine -> A B C D E F G H

Group Ranking -> 2 6 3 5 1 7 8 3
Votes Against -> 22 30 24 28 16 34 38 24

( 6 is the best possible, 48 is the worst)

Here is a measure of the correlation in the preferences of the judges which
ranges between 1.0 (perfect correlation) and 0.0 (no correlation):

W = 0.2275

The probability that random chance could be responsible for this correlation
is rather large, 0.2152. Most analysts would say that unless this
probability is less than 0.1, the judges' preferences are not strongly
related.
We now analyze how each taster's preferences are correlated with the group
preference. A correlation of 1.0 means that the taster's preferences are a
perfect predictor of the group's preferences. A 0.0 means no correlation,
while a -1.0 means that the taster has the reverse ranking of the group.
This is measured by the correlation R.

Correlation Between the Ranks of
Each Person With the Average Ranking of Others

Name of Person Correlation R Correlation Price

Dick 0.6667 -0.3516
John 0.5270 0.2061
Bob 0.4762 -0.2667
Burt 0.2410 -0.6668
Orley 0.0000 -0.0364
Ed -0.4072 0.3395

The wines were preferred by the judges in the following order. When the
preferences of the judges are strong enough to permit meaningful differentiation
among the wines, they are separated by -------------------- and are judged to be
significantly different.

1. ........ 1st place Wine E is Bressandes (Prince Florent) 2002
---------------------------------------------------
2. ........ 2nd place Wine A is Bressandes (Prince Florent) 2005
3. tied for 3rd place Wine H is Clos du Roi (Girardin) 1997
4. tied for 3rd place Wine C is Bressandes (Lucien de Moine) 2003
5. ........ 5th place Wine D is Renardes (Girardin) 1998
6. ........ 6th place Wine B is (Toillot-Beaut) 1995
7. ........ 7th place Wine F is Clos du Roi (Vougeraie) 2002
---------------------------------------------------
8. ........ 8th place Wine G is Clos du Roi (Chandon de Brialles)

We now test whether the ranksums AS A WHOLE provide a significant ordering.
The Friedman Chi-square value is 9.5556. The probability that this could
happen by chance is 0.2152

We now test whether the group ranking of wines is correlated with the
prices of the wines. The rank correlation between them is -0.2988. At the
10% level of significance this would have to exceed the critical value of
0.5240 to be significant.

We now undertake a more detailed examination of the pair-wise rank correla-
tions that exist between pairs of judges. First, we present a table in which you
can find the correlation for any pair of judges, by finding one of the names in the
left hand margin and the other name on top of a column. A second table arranges
these correlations in descending order and marks which is significantly positive
significantly negative, or not significant. This may allow you to find clusters
of judges whose rankings were particularly similar or particularly dissimilar.

Pairwise Rank Correlations

Correlations must exceed in absolute value 0.74 for significance at the 0.05
level and must exceed 0.64 for significance at the 0.1 level

Orley Ed Burt

Orley 1.000 -0.071 0.190
Ed -0.071 1.000 -0.619
Burt 0.190 -0.619 1.000
Bob -0.143 -0.524 0.238
John 0.262 0.048 -0.167
Dick -0.095 -0.262 0.595

Bob John Dick

Orley -0.143 0.262 -0.095
Ed -0.524 0.048 -0.262
Burt 0.238 -0.167 0.595
Bob 1.000 0.500 0.643
John 0.500 1.000 0.500
Dick 0.643 0.500 1.000

Pairwise correlations in descending order

0.643 Bob and Dick Not significant
0.595 Burt and Dick Not significant
0.500 Bob and John Not significant
0.500 John and Dick Not significant
0.262 Orley and John Not significant
0.238 Burt and Bob Not significant
0.190 Orley and Burt Not significant
0.048 Ed and John Not significant
-0.071 Orley and Ed Not significant
-0.095 Orley and Dick Not significant
-0.143 Orley and Bob Not significant
-0.167 Burt and John Not significant
-0.262 Ed and Dick Not significant
-0.524 Ed and Bob Not significant
-0.619 Ed and Burt Not significant

COMMENT:

These are well made and relatively young wines, and from the same
vineyard, albeit one of the largest in Burgundy. There were no corked
wines, or wines with other obvious flaws.
The most preferred wine, by a top Burgundian producer, Prince Florent de
Meraude, achieved a distinguished consensus. This demonstrates, among
other things,the quality of the 2002 vintage.
The Prince Florent wines were number 1 and 2 in the tasting and that
suggests the high quality of this producer, although strictly speaking,
there is an identification problem here, since the top two wines were Corton
Bressandes, which also tied for third place. Furthermore, the number 2
placing of the 2005 vintage is suggestive that this vintage may
have overall good potential. As a side note, we observe that the Prince de
Florent wines had a lighter, some would say more correct, color.

The interested reader may wish to compare this tasting to another Corton tasting that took
place almost one year later, which is reported in Report 126.

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