Translations:Growth/Analytics updates/Welcome survey initial report/88/en

How did we determine how many users had not provided an email address at signup to be able to calculate that proportion? This is not trivial, because the MediaWiki database does not store a timestamp of when a user added their email address, nor is there an EventLogging schema in use for logging that kind of information either. The only piece of information in the database that seemed related is the expiration timestamp of the verification token that is emailed to the user when they enter their email address.