I am pretty beginner so excuse me if this is a remedial question, I have tried googling the answer and haven't been able to find the answer. I am working with survey data that has two waves. I want to only use the participants that answered the survey for both waves and throw out the ones who did not do the follow up. I have both waves merged into the same large set, so ideally what I want to do is delete out any of the participants in the first wave that do not have follow ups attached. What is the best way to go about this?
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