Data quality

Some important things to know:

• Quality does not make sense for itself.
• Quality depends on usages.
• No database at all can pretend to zero-default.
• With more than 1 200 000 products, there are quality concerns: our goal is to lower the impacts of the issues.

Data quality: how to help?

Nutri-Score quality

Some products now have Nutri-Score printed on the front of pack. Some differs from our Nutri-Score calculation. We should take care about that:

• Nutri-Score printed A but calculated E
• Nutri-Score printed A but calculated D
• Nutri-Score printed A but calculated C
• Nutri-Score printed E but calculated A
• Nutri-Score printed E but calculated B
• Nutri-Score printed E but calculated C
• Nutri-Score printed D but calculated A
• Nutri-Score printed D but calculated B
• Nutri-Score printed D but calculated C
• Nutri-Score printed B but calculated E
• Nutri-Score printed B but calculated D
• Nutri-Score printed B but calculated C

There are many reasons why it can differ:

• the label in Open Food Facts does not represent the label printed on the package (easy to solve)
• the label is correct but our calculation doesn't provide the same result:
  • check the category,
  • then check the nutrition facts: the issue is sometimes the lack of "fibers" information or the lack of "Fruits, vegetables, nuts and rapeseed, walnut and olive oils" percentage.
• it can be a software issue (quite rare but possible)

Nutrition values issues

Open Food Facts identifies some issues related to nutrition values. We should take care of it:

• Nutrition Salt is higher than 100g per 100g
• Carbohydrate is higher than 100g per 100g
• Fat is higher than 100g per 100g