I'm attempting to conduct a survey using proportionate stratified random sampling and I'm trying to figure out how to keep track of which group my participants are in without collecting identifiable information. I have four groups (City, Suburb, Rural, and Town) that I am trying to gain a representative sample from. However, the participants wouldn't already know which group they are in and I don't want them to have to report their school district (which is how I am determining their group). So, my ideas are to create a question where participants would have to enter a code that I include in the recruitment email that would correspond to the given groups (i.e. 4001 = City, 4002 = Suburb, etc.). The code would be the same for all the participants that meet the criteria for City and so on. I could then use this code in my analysis to compare groups. I've also thought about copying the survey to create a unique URL for each group and then applying an identifier in a new variable once I h
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