Tracking whether a respondent has previously participated, and if so, do some branching.

TheSav · 2022-08-03T10:37:47+00:00

Hi.Step 1I want to create a base survey (with an appended Unique ID - UID) such that when a participant opens it in a web browser, it checks if the UID in the URL already exists.Step 2If the UID already exists it then it randomly picks one of three possible subsequent surveys to run (e.g. A, B or C) that have not yet been completed.In order for this to work I need to have a way to store the UID and whether survey A, B or C has been completed. so my logic is this:When the base survey is first run, I check if data for that UID exists. If it does then all subsequent answers update that file.If it does exist, randomly select survey A, B or C. For each survey, there will be a corresponding var indicating whether that survey has been done (e.g. varA, varB or varC). Loop through each one until a non-complete survey has been found and then quit when that survey is done (marking the corresponding var as complete). If it does not exist, then simply randomly pick on the 3 surveys to run. I know how to do the randomisation bit etc. What I need to know is, is it possible to check if a UID has already got data, and if so can it be updated in this way? NB. I want to use the same link for each participant (differentiated only by UID) rather than have three separate links. The rationale for this is that I am setting up a multipart study in EMS and there's no way to randomise the multipart order that I know of.

Tracking whether a respondent has previously participated, and if so, do some branching. | Experience Community

Sign up

Login to the Community

Scanning file for viruses.

This file cannot be downloaded