WINETASTER ON 05/29/00 WITH 7 JUDGES AND 7 WINES BASED ON RANKS, IDENT=N Copyright (c) 1995-2000 Richard E. Quandt
FLIGHT 1: Number of Judges = 7 Number of Wines = 7
Identification of the Wine: The judges' overall ranking:
Wine A is Iron Horse Alexander Valley 1979 ........ 3rd place Wine B is BV Latour 1978 ........ 1st place Wine C is BV Latour 1982 ........ 2nd place Wine D is Jordan 1978 ........ 4th place Wine E is BV Latour 1985 ........ 5th place Wine F is BV Rutherford 1977 ........ 7th place Wine G is Ch. Latour 1979 ........ 6th place
The Judges's Rankings
Judge Wine -> A B C D E F G Grant 6. 1. 4. 5. 7. 3. 2. Orley 5. 1. 2. 6. 3. 7. 4. Jack 2. 1. 3. 7. 5. 4. 6. Burt 2. 1. 4. 3. 5. 7. 6. Ed 3. 2. 1. 5. 4. 7. 6. John 3. 2. 1. 4. 5. 6. 7. Dick 2. 1. 4. 3. 5. 6. 7.
Table of Votes Against Wine -> A B C D E F G
Group Ranking -> 3 1 2 4 5 7 6 Votes Against -> 23 9 19 33 34 40 38
( 7 is the best possible, 49 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 = 0.5627
The probability that random chance could be responsible for this correlation is quite small, 0.0006. 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 Ed 0.9286 John 0.9190 Burt 0.8214 Dick 0.7857 Jack 0.6429 Orley 0.6071 Grant 0.0357
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 B is BV Latour 1978 --------------------------------------------------- 2. ........ 2nd place Wine C is BV Latour 1982 3. ........ 3rd place Wine A is Iron Horse Alexander Valley 1979 4. ........ 4th place Wine D is Jordan 1978 5. ........ 5th place Wine E is BV Latour 1985 --------------------------------------------------- 6. ........ 6th place Wine G is Ch. Latour 1979 7. ........ 7th place Wine F is BV Rutherford 1977 We now test whether the ranksums AS A WHOLE provide a significant ordering. The Friedman Chi-square value is 23.6327. The probability that this could happen by chance is 0.0006 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 0.79 for significance at the 0.05 level and must exceed 0.71 for significance at the 0.1 level Grant Orley Jack Grant 1.000 0.250 0.250 Orley 0.250 1.000 0.500 Jack 0.250 0.500 1.000 Burt 0.000 0.464 0.536 Ed -0.071 0.786 0.643 John -0.036 0.571 0.643 Dick -0.036 0.357 0.607 Burt Ed John Grant 0.000 -0.071 -0.036 Orley 0.464 0.786 0.571 Jack 0.536 0.643 0.643 Burt 1.000 0.714 0.750 Ed 0.714 1.000 0.929 John 0.750 0.929 1.000 Dick 0.964 0.679 0.786 Dick Grant -0.036 Orley 0.357 Jack 0.607 Burt 0.964 Ed 0.679 John 0.786 Dick 1.000 Pairwise correlations in descending order 0.964 Burt and Dick Significantly positive 0.929 Ed and John Significantly positive 0.786 John and Dick Significantly positive 0.786 Orley and Ed Significantly positive 0.750 Burt and John Significantly positive 0.714 Burt and Ed Significantly positive 0.679 Ed and Dick Not significant 0.643 Jack and Ed Not significant 0.643 Jack and John Not significant 0.607 Jack and Dick Not significant 0.571 Orley and John Not significant 0.536 Jack and Burt Not significant 0.500 Orley and Jack Not significant 0.464 Orley and Burt Not significant 0.357 Orley and Dick Not significant 0.250 Grant and Orley Not significant 0.250 Grant and Jack Not significant 0.000 Grant and Burt Not significant -0.036 Grant and Dick Not significant -0.036 Grant and John Not significant -0.071 Grant and Ed Not significant
COMMENT: The remarkable thing about this tasting was the strong agreement among tasters. The first place wine received 5 first place votes and 2 second place votes, possibly the greatest agreement we have ever had. The last placed wine was ranked near to last by most tasters, and some thought it was slightly oxidized. One big surprise was the performance of the Iron Horse '79, which would sell for about $15 a bottle in an auction, and was ranked in the top three in this tasting. There is general agreement on the high level of the BV George Delatour Private Reserves across three vintages. The '79 Latour is an example of an herbacious somewhat green Bordeaux that has just not come around to fulfill its potential.
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