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Question: What is selection bias?


” Selection bias is when you have non-random data that is causing your results to skew towards whatever data you had obtained. This can happen if you sample a certain demographic instead of others, or at certain times instead of others, etc. There are a few statistical solutions to this problem, such as an instrumental variable or propensity score matching, but it’s always cleanest if you can simply avoid selection bias with proper random assignment. “


  1. Includes sampling biastime intervaldata biasattrition, and more.

  2. Offer a solution if possible..