GWM (Global Wine Rating) as a logical extension of Global Wine Medal Rating
GWR (Global Wine Rating) is a revolutionary platform for wine enthusiasts, winemakers, and retailers. Our AI-driven 100-point system combines medals, critic’s and wine lover’s scores, aggregating evaluations from various sources, including global wine competitions, for objective quality assessment.
Today is an exciting milestone as we unveil the first version of GWR. With this launch, we seamlessly blend the accolades from GWMR (Medal Wine Rating) with Vivino ratings for over 100,000 wines within our extensive database. Consequently, any user exploring our platform can now take advantage of both GWMR and GWR sorting options when searching for the finest wines in their chosen categories. This harmonious integration promises an enhanced wine discovery experience for all.
1. Mathematical approach
Our initial challenge revolved around converting Vivino’s 5-point rating scale into a 100-point scale, aligning with the requirements of our rating system. We meticulously assessed several conversion methods, including this one:.
However, none of these methods seamlessly met our criteria. Consequently, we embarked on the development of a novel conversion approach. This approach underwent rigorous validation using a representative sample of analogous concepts, ensuring its accuracy and effectiveness. Here are the numbers we got:
Upon applying the Vivino score conversion algorithm, we created two new fields: “100_points_vivino” and “diff,” representing the difference between GWMR and the “100_points_vivino” rating.
The distribution of GWMR and “100_points_vivino” ratings is as follows:
Interestingly, within the range of 85–100 ratings, the distributions are very similar:
By the “diff” field (difference between GWMR and “100_points_vivino” rating), the data are distributed as follows:
The results revealed a few anomalies, but their total count was less than 4%, rendering these records statistically negligible. After excluding these anomalies for further study, we obtain a graph illustrating the distribution of rating differences.:
GWMR appears to rate wines slightly lower than Vivino, which aligns with our expectations, as consumer ratings generally tend to be higher than professional ones. Within the range of scores from 85–100, encompassing over 70% of the total number of records, the graph adheres closely to a normal distribution:
The range -5:5 covers the absolute majority and corresponds to the range of
Robert Parker scores:
- Extraordinary
- Outstanding
- Above Average to Very Good
- Average
- Below Average
- Unacceptable
The ultimate GWMR score, which incorporates both wine medals and the Vivino score, is computed as the average between the GWMR score and the 100 Points Vivino score. Nevertheless, if these scores exhibit a variance exceeding 5 points, the GWR score tends to align more closely with the professional rating.
2. The practical use
Satisfied with the results and their comparative validation, we conducted a large-scale reconciliation between our wine database and their counterparts on Vivino. The volume of data was too extensive for manual processing, prompting us to employ AI algorithms to establish links between wine IDs in our database and those on Vivino. The verification sample demonstrated a 90% accuracy rate for the matched data.
The only minor challenge we encountered is the absence of precise scores for some of wine vintages on Vivino, as a minimum number of customer reviews is required for this purpose. In such cases, we import the wine rating based on the scores for all vintages, precisely following Vivino’s calculations.
As a result, each wine now displays two types of ratings:
- GWMR score (calculated using the traditional method, considering only wine medals at professional competitions).
- New GWR score, the innovative combined rating derived from both GWMR and Vivino.
Additionally, we have enhanced our website to offer two sorting options for wines: by GWMR and GWR.
In the near future, the GWR score will also begin to incorporate wine critic scores, evolving into a comprehensive tool for comparing wine quality, aggregating assessments from all three rating methods.
