Data quality: Difference between revisions

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Revision as of 16:39, 15 February 2023

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 2 700 000 products, there are quality concerns: our goal is to lower the impacts of the issues.

Data quality principles at Open Food Facts

[summary + link]

How do we manage data quality?

How to help?

Anyone can help to improve the data quality.

1. Adding photos

Photos allow other contributors to verify and, if necessary, fix the issues. As a contributor, this is the first step to improve data quality.

2. Fixing a product issue

As in Wikipedia, anyone can edit at Open Food Facts. If you see an error, don't hesitate to fix it! If you're afraid or hesitating, you can ask your questions on the forum or in our Slack space.

3. Report an issue related to many products or related to data quality

Sometimes you can discover issues related to many products or related to data quality.

You can report the issue on the forum or in our Slack space.
You can also directly report the issue directly on our bug reporting tool.

4. Help improve data quality with specific missions

If you want to further, you can check specific missions related to data quality. Some missions are fast and easy to achieve.

5. Joining the effort to improve data quality

We organize a public monthly meeting dedicated to data quality. It takes place every first Tuesday of the month at 6pm CET, see Open Food Facts' events to find the next meetings in our community calendar.

If you have technical skills, you can also do your part for data quality. Head over to our tracking issue on GitHub

Tools

[to be completed]

Data quality measurement

We have started an initiative to measure and publish continuously some data quality stats. We have created a specific page dedicated to data quality stats.

Quality facets

[to be described]

Data quality daily

Data quality daily is a daily email suggesting you 3 Open Food Facts products to fix.

this is your mission, these 3 products are not sent to other users
these products should be fixable (photos)
products' popularity is taken into account (number of scans last year): your fixes have a higher impact
you also get nice daily stats about data quality, including a contributors' board.

Don't hesitate to register, you can unsubscribe at any time.

Power User Script

Power User Script is a user script for your browser, to empower Open Food Facts contribution. It offers many enhancements for contributors, and many features dedicated to data quality.

Reference / documentation

Quality facets

There are more than 180 data quality facets. You can consult the list of data quality errors.

Data quality issues which can't be fixed

Some data quality issues can't be fixed due to different reasons. See the dedicated page: Data quality issues which can't be fixed.

@@ Line 2: / Line 2: @@
 * Quality does not make sense for itself: quality depends on usages.
 * No database at all can pretend to zero-default.
-* With more than 2 600 000 products, there are quality concerns: our goal is to lower the impacts of the issues.
+* With more than 2 700 000 products, there are quality concerns: our goal is to lower the impacts of the issues.
-== Data quality: how to help? ==
+== Data quality principles at Open Food Facts ==
+[summary + link]
-=== Nutrition values issues ===
+== How do we manage data quality? ==
-Open Food Facts identifies some issues related to nutrition values. Some of them are '''very easy to solve''':
-* [https://world.openfoodfacts.org/data-quality/energy-value-in-kcal-greater-than-in-kj Energy value in kcal greater than in kJ]
-* [https://world.openfoodfacts.org/data-quality/nutrition-value-over-105-salt Nutrition Salt is higher than 100g per 100g]
-* [https://world.openfoodfacts.org/data-quality/nutrition-value-over-105-carbohydrates Carbohydrate is higher than 100g per 100g]
-* [https://world.openfoodfacts.org/data-quality/nutrition-value-over-105-fat Fat is higher than 100g per 100g]
-=== Nutri-Score quality ===
+== How to help? ==
-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:
+Anyone can help to improve the data quality.
-* [https://world.openfoodfacts.org/nutrition-grade/e/label/nutriscore-grade-a Nutri-Score printed A but calculated E]
-* [https://world.openfoodfacts.org/nutrition-grade/d/label/nutriscore-grade-a Nutri-Score printed A but calculated D]
-* [https://world.openfoodfacts.org/nutrition-grade/c/label/nutriscore-grade-a Nutri-Score printed A but calculated C]
-* [https://world.openfoodfacts.org/nutrition-grade/a/label/nutriscore-grade-e Nutri-Score printed E but calculated A]
-* [https://world.openfoodfacts.org/nutrition-grade/b/label/nutriscore-grade-e Nutri-Score printed E but calculated B]
-* [https://world.openfoodfacts.org/nutrition-grade/c/label/nutriscore-grade-e Nutri-Score printed E but calculated C]
-* [https://world.openfoodfacts.org/nutrition-grade/a/label/nutriscore-grade-d Nutri-Score printed D but calculated A]
-* [https://world.openfoodfacts.org/nutrition-grade/b/label/nutriscore-grade-d Nutri-Score printed D but calculated B]
-* [https://world.openfoodfacts.org/nutrition-grade/c/label/nutriscore-grade-d Nutri-Score printed D but calculated C]
-* [https://world.openfoodfacts.org/nutrition-grade/e/label/nutriscore-grade-b Nutri-Score printed B but calculated E]
-* [https://world.openfoodfacts.org/nutrition-grade/d/label/nutriscore-grade-b Nutri-Score printed B but calculated D]
-* [https://world.openfoodfacts.org/nutrition-grade/c/label/nutriscore-grade-b 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).
-{| class="wikitable"
-|+
-!Issue
-!Rationale
-!How to fix
-|-
-|The Nutri-Score displayed by the producer is different from the Nutri-Score Open Food Facts computes
-|The label in Open Food Facts does not represent the label printed on the package
-|Change the label
-|-
-|idem
-|The category is wrong
-|Change the category and see if it's modifying the Nutri-Score
-|-
-|idem
-|The nutrition facts are wrong
-|
-* Update it
-* If the product's nutrition facts has evolved from a previous version, you can add it to the [[Verification/Noteworthy Products#Products with a Nutri-Score that has improved over time|products whose recipe has changed]] or even better, if it's the case, the [[Verification/Noteworthy Products#Products with a Nutri-Score that has improved over time|products with a Nutri-Score that has improved over time]].
-|}
-=== Cleaning up the consequences of an old Android bug ===
+=== 1. Adding photos ===
-The word "Loading…" replaced the correct product name. 99% of phones have been updated with the fix, but we still have some unfixed products.
+Photos allow other contributors to verify and, if necessary, fix the issues. As a contributor, this is the first step to improve data quality.
-* [https://world.openfoodfacts.org/cgi/search.pl?action=process&search_terms=Caricamento%E2%80%A6&sort_by=unique_scans_n&page_size=24&page=1&sort_by=unique_scans_n Italian]
-* [https://world.openfoodfacts.org/cgi/search.pl?action=process&search_terms=Loading%E2%80%A6&sort_by=unique_scans_n&page_size=24&page=1&sort_by=unique_scans_n English]
-* [https://world.openfoodfacts.org/cgi/search.pl?action=process&search_terms=chargement%E2%80%A6&sort_by=unique_scans_n&page_size=24&page=1&sort_by=unique_scans_n French]
-* [https://world.openfoodfacts.org/cgi/search.pl?search_terms=laden%E2%80%A6&search_simple=1&action=process German]
-=== Non-Food Products ===
+=== 2. Fixing a product issue ===
-Some people are adding products which are not food: beauty products, books, pet food, etc. These products have to be moved to Open Food Facts side projects. Our AI (artificial intelligence) already identifies many cases. These cases are published in the [https://app.slack.com/client/T02KVRT1Q/CT2N423PA/thread/GCUD53J5R-1586349162.333800?cdn_fallback=2 #bot-image-alerts] channel on our slack space.
+As in Wikipedia, anyone can edit at Open Food Facts. If you see an error, don't hesitate to fix it! If you're afraid or hesitating, you can ask your questions on [https://forum.openfoodfacts.org the forum] or in our [https://slack.openfoodfacts.org/ Slack space].
-==== How to move these products? ====
+=== 3. Report an issue related to many products or related to data quality ===
-* identify a product in the [https://app.slack.com/client/T02KVRT1Q/CT2N423PA/thread/GCUD53J5R-1586349162.333800?cdn_fallback=2 #bot-image-alerts] channel
+Sometimes you can discover issues related to many products or related to data quality.
-* clic on the link after "edit:"
-* if you have the rights to so, you will see "If the barcode is not correct, please correct it here"
-** enter "obf" to move beauty products to Open Beauty Facts
-** enter "opff" to move products to Open Pet Food Facts
-** enter "opf" to move products to Open Product Facts
-* save (if "A product already exists with the new code" message appear, move it manually, and delete it)
-* in [https://app.slack.com/client/T02KVRT1Q/CT2N423PA/thread/GCUD53J5R-1586349162.333800?cdn_fallback=2 #bot-image-alerts] channel, annotate the product with a "checked" icon to tell others that the product has been moved
-== Data quality issues which can't be fixed ==
+* You can report the issue on [https://forum.openfoodfacts.org the forum] or in our [https://slack.openfoodfacts.org/ Slack space].
-Some data quality issues can't be fixed due to different reasons. See the dedicated page: [[Data quality issues which can't be fixed]].
+* You can also directly [https://github.com/openfoodfacts/openfoodfacts-server/issues/new/choose report the issue directly on our bug reporting tool].
+=== 4. Help improve data quality with specific missions ===
+If you want to further, you can check [[Data quality missions|specific missions related to data quality]]. Some missions are fast and easy to achieve.
+=== 5. Joining the effort to improve data quality ===
+We organize a public monthly meeting dedicated to data quality. It takes place every first Tuesday of the month at 6pm CET, see [[Events|Open Food Facts' events]] to find the next meetings in our community calendar.
+If you have '''technical skills''', you can also do your part for data quality. Head over to [https://github.com/openfoodfacts/openfoodfacts-server/issues/5538 our tracking issue on GitHub]
+== Tools ==
+[to be completed]
-== Data quality measurement ==
+=== Data quality measurement ===
 We have started an initiative to measure and publish continuously some data quality stats. We have created a specific page dedicated to [[data quality stats]].
+=== Quality facets ===
+[to be described]
+=== Data quality daily ===
+[https://mirabelle.openfoodfacts.org/-/data-quality-daily/subscribe Data quality daily] is a daily email suggesting you 3 Open Food Facts products to fix.
+* this is ''your'' mission, these 3 products are not sent to other users
+* these products should be fixable (photos)
+* products' popularity is taken into account (number of scans last year): your fixes have a higher impact
+* you also get nice daily stats about data quality, including a contributors' board.
+Don't hesitate to [https://mirabelle.openfoodfacts.org/-/data-quality-daily/subscribe register], you can unsubscribe at any time.
+=== Power User Script ===
+[https://github.com/openfoodfacts/power-user-script Power User Script] is a user script for your browser, to empower Open Food Facts  contribution. It offers many enhancements for contributors, and many features dedicated to data quality.
+== Reference / documentation ==
+=== Quality facets ===
+There are more than 180 data quality facets. You can consult the [[List of data quality errors (generated)|list of data quality errors]].
+=== Data quality issues which can't be fixed ===
+Some data quality issues can't be fixed due to different reasons. See the dedicated page: [[Data quality issues which can't be fixed]].
 [[Category:Quality]]
+[[Category:Data quality]]
-== Helping technically with data quality ==
-* If you have technical skills, you can also do your part for data quality. Head over to [https://github.com/openfoodfacts/openfoodfacts-server/issues/5538 our tracking issue on GitHub]