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## Inclusion criteria The original data sample was generated by sampling users with the following characteristics: - Sign-up between Aug 1, 2013 and December 31st, 2016 - Age at signup between 18 and 90 - From the US, Canada, or Australia - English is preferred language - At least 500 lifetime gameplays - At least 99% of their lifetime Lumosity gameplays were on the web product (as opposed to mobile apps) - To exclude users who choose to repeat specific games rather than play from the broader game library, we only included users if 5% or fewer of their gameplays were repetitions of the previous game. - Gameplay records for the set of users defined above are include from Aug 1, 2013 through June 30th, 2019.
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