I want to compare survey results taken from the same group at two different time points but the sample has changed.

I assume I would do a T test for this. However, for one group that I’m comparing, 15% of the group was unavailable for the second survey. And in another group, there were 5 additional people out of 45 people present that weren’t there for the first survey. The survey was anonymous so I can’t link answers from the first and second surveys. How do I handle this kind of data discrepancy? submitted by /u/gremlin989 [link] [comments]

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