Apologies if this is the wrong subsection.
I'm trying to replicate some findings from a survey I distributed a couple years ago (the sample size was about 500 people). Is it a problem-- a statistical faux pas if you will-- if some of the people who filled out the original survey take it again?
I don't remember the consensus on this. I sent out the original survey about 2 years ago, so I'd be surprised if the original respondents would even remember. (I can get a lot of responses through particular university email lists I have access to). It's for academic research.