For my survey I would like participants to fill in the survey twice, with an interval of a week, to determine the questionnaires internal consistency. However, I want their data to be anynomous. Is there some way to ask people their e-mail address in such a way that when they fill it in, it becomes a random code or something? And then when a week passes, a link to the survey is emailed to the participants and when they fill the survey in again, the first response becomes linked to the second response (for analysis).
Thanks in advance.
Best answer by TomG
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