experts. For the two datasets, each expert graded the wine quality between 0 (very bad) and 10 (very excellent). Unfortunately, there is no data about grape types, wine brand, wine selling price, etc. FIGURE 1: DESCRIPTION OF VARIABLES FOR WINE QUALITY_WHITE AND WINE QUALITY RED DATASET Variable If Categorical Var. Variable Type Ordinal/Nominal Units 1 Fixed Acidity Numerical grams/liter 2 Volatile Acidity Numerical grams/liter 3 Citric Acidity Numerical grams/liter 4 Residual Sugar Numerical grams/liter 5 Chlorides Numerical grams/liter Free sulphur di- 6 oxide Numerical milligrams/liter Total sulphur di- 7 oxide Numerical milligrams/liter grams/cubic 8 Density Numerical centimeter 9 PH Numerical N/A 10 Sulphates Numerical grams/liter 11 Alcohol Numerical % volume Quality (0- Very Bad, 12 10-Very Excellent) Categorical Ordinal N/A