How to ask particular participants twice
I am planning two web-experiments that are time-delayed. In experiment 1, I will send the web-link to all participants. However, in experiment 2, I would only like to aks particular participants of experiment 1 (those that are likely to purchase the product displayed in exeriment 1).Thus, I would like to send the link for experiment 2 only to particular participants of experiment 1.
Is there a possibility to track such participants (e.g. via codes??) without asking them for personal details? In fact, I would like to send the link
I look forward to receiving some help for this isse,
Thanks a lot in advance,