# Linking participants repsonses in two time frame data collections

**URL:** <https://discourse.psychopy.org/t/linking-participants-repsonses-in-two-time-frame-data-collections/32783>\
**Category:** Pavlovia Surveys\
**Tags:** pavlovia\
**Created:** [January 14, 2023, 5:10pm UTC](https://discourse.psychopy.org/t/linking-participants-repsonses-in-two-time-frame-data-collections/32783 "2023-01-14T17:10:59Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Amy\_Maguire](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.psychopy.org/amy_maguire/32/36650_2.png) [@Amy\_Maguire](https://discourse.psychopy.org/u/Amy_Maguire)\
**Post date:** [January 14, 2023, 5:10pm UTC](https://discourse.psychopy.org/t/linking-participants-repsonses-in-two-time-frame-data-collections/32783/1 "2023-01-14T17:10:59Z")

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Has anyone idea how do you allow participants to generate individual codes so they can access the survey at time 1 ( pre intervention) and then at time 2 (post intervention) ? Is there a way to link the participants’ responses from time 1 and 2? while keeping it all anonymous?

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**Author:** ![wakecarter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.psychopy.org/wakecarter/32/5753_2.png) [@wakecarter](https://discourse.psychopy.org/u/wakecarter)\
**Post date:** [January 14, 2023, 5:19pm UTC](https://discourse.psychopy.org/t/linking-participants-repsonses-in-two-time-frame-data-collections/32783/2 "2023-01-14T17:19:00Z")

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I have a method for creating a participant ID based on email addresses, which isn’t back translatable. It does, of course, rely on the participant remembering which email address they used.

[https://moryscarter.com/vespr/id.php](https://moryscarter.com/vespr/id.php)

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**Author:** ![Colin\_Burke](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.psychopy.org/colin_burke/32/11798_2.png) [@Colin\_Burke](https://discourse.psychopy.org/u/Colin_Burke)\
**Post date:** [January 16, 2023, 4:01pm UTC](https://discourse.psychopy.org/t/linking-participants-repsonses-in-two-time-frame-data-collections/32783/3 "2023-01-16T16:01:56Z")

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Not sure if this is helpful, but you could ask a question at the beginning of Survey Time 1 and then Survey Time 2, that the participant would know the answer to without having to remember a code. These could be matched later. Something as unique as possible: for example…

 ![PIN4](https://us1.discourse-cdn.com/flex002/uploads/psychopy/original/3X/0/e/0e16e899949741647e3e521fb5fd6d12d6cae6cd.png)

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**Author:** ![Amy\_Maguire](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.psychopy.org/amy_maguire/32/36650_2.png) [@Amy\_Maguire](https://discourse.psychopy.org/u/Amy_Maguire)\
**Post date:** [January 16, 2023, 8:50pm UTC](https://discourse.psychopy.org/t/linking-participants-repsonses-in-two-time-frame-data-collections/32783/4 "2023-01-16T20:50:41Z")

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Hi Colin,

That’s a very good suggestion!

Thanks so much

Amy