We use the email field as a not repeatable field, no avail. We still get 75% + fraud! Thank you for any advice! :)
Prof-Dr-Ahmed Al-Baidhani أ. د. احمد البيضاني
The following two papers talk about the issue; you may want to check them out:
Strategies for the identification and prevention of survey fraud: Data analysis of a web-based survey
M Pratt-Chapman, J Moses, H Arem - JMIR cancer, 2021 - cancer.jmir.org
Development of a fraud detection plan in a survey of canadian abortion providers.
M Ennis, W Norman, J Kaczorowski, S Dunn, R Renner… - 2022 - Annals Family Med
8 votes
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Michael Felix Noel
DO a web based survey NOT email based and do it through a paid online platform . They will track the users for you and prevent the spam
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