Analytics/AQS/Unique Devices

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This page documents the Unique Devices dataset (v1) as developed and maintained by the Wikimedia Foundation since January 1st, 2016. This data set contains the number of unique devices having visited Wikipedia or its sisters project over some period of time, and is accessible through downloading files or via the AQS API. An extended database version of the same data (including country-level numbers) is available internally on Hive, see Analytics/Data Lake/Traffic/Unique Devices.

Quick Start

AQS API

Technical Documentation: https://wikimedia.org/api/rest_v1/?doc (includes interactive examples).

Get the daily number of unique devices for en.wikipedia.org for the month of February 2016, for all sites (desktop and mobile; please have in mind that if a device visits the desktop and mobile site it is counted twice):

GET http://wikimedia.org/api/rest_v1/metrics/unique-devices/en.wikipedia.org/all-sites/daily/20160201/20160229

Get the monthly number of unique devices for the mobile version of fr.wikipedia.org for the months of January, February and March 2016:

GET http://wikimedia.org/api/rest_v1/metrics/unique-devices/fr.wikipedia.org/mobile-site/monthly/20160101/20160301

Get the daily number of unique devices for the desktop version of es.wikipedia.org for the first ten days of April 2016:

GET http://wikimedia.org/api/rest_v1/metrics/unique-devices/es.wikipedia.org/desktop-site/daily/20160401/20160410

Downloads

You can find daily and monthly data TSV files at this address: https://dumps.wikimedia.org/other/unique_devices/.

Files include three columns: underestimate, offset, total

To see what each of these three numbers mean, please read: Analytics/Data_Lake/Traffic/Unique_Devices/Last_access_solution

Data Quality

To ensure we provide quality information, we have made the choice of including in the files and the API only projects having at least 1,000 (one thousand) unique devices for the considered time period (day or month). Projects with less than 1000 unique devices show too much random variation for data to be actionable.

More information on how 1,000 was selected as the limit is available in the Last access solution subpage.

More Reading

Metric Definition

https://meta.wikimedia.org/wiki/Research:Unique_Devices

Why the name "unique devices"

https://meta.wikimedia.org/wiki/Research:Unique_Devices#Why_the_name_unique_devices

Differences between unique devices and unique users

https://meta.wikimedia.org/wiki/Research:Unique_Devices#Differences_between_unique_devices_and_unique_users

Can we count unique users instead of devices?

The answer is no, regardless of method. We could only do that if we ask everyone to login to use wiki projects.

How do we count unique devices?

We use a very private conscious way to count unique devices, it does not include any cookie by which your browser history can be tracked. Analytics/Data Lake/Traffic/Unique Devices/Last access solution

Underlying database

Analytics/Data Lake/Traffic/Unique Devices (not public, includes additional country-level information)

The Analytics Query Service API (AQS)

Analytics/AQS