THE RESULT
What the data shows
The largest computed metric is 6.725 for white / (13, 20]; the smallest is 5.293 for red / (9, 10]. Metric: mean_quality (Sensory score).
Require at least 30 samples per band. Other chemical attributes differ between these groups.
| wine type | alcohol band | samples | median quality | mean quality | group |
|---|---|---|---|---|---|
| red | (0, 9] | 37 | 6 | 5.351 | red / (0, 9] |
| red | (10, 11] | 444 | 6 | 5.691 | red / (10, 11] |
| red | (11, 12] | 267 | 6 | 6.071 | red / (11, 12] |
| red | (12, 13] | 118 | 6 | 6.424 | red / (12, 13] |
| red | (9, 10] | 710 | 5 | 5.293 | red / (9, 10] |
| white | (0, 9] | 502 | 5 | 5.6 | white / (0, 9] |
| white | (10, 11] | 1,252 | 6 | 5.864 | white / (10, 11] |
| white | (11, 12] | 850 | 6 | 6.191 | white / (11, 12] |
| white | (12, 13] | 609 | 7 | 6.571 | white / (12, 13] |
| white | (13, 20] | 102 | 7 | 6.725 | white / (13, 20] |
| white | (9, 10] | 1,583 | 5 | 5.488 | white / (9, 10] |
THE METHOD
From source to answer
Stratified alcohol bands with sample counts and quality medians.
The Python source exposes this study’s transformations. The complete project download includes shared preparation and evaluation routines.
THE NEXT DECISION
What follows from the finding
Use the stratified pattern to motivate a controlled laboratory study rather than a recipe claim.
Where the conclusion stops
Sensory scores are ordinal and concentrated in the middle. Producer and batch IDs are unavailable. Associations are not recipes for changing quality or evidence of market price.
Related studies may reuse observations or holdouts. These are historical analyses; associations and backtests do not demonstrate commercial impact. Further model tuning needs new, untouched evaluation data.