Survivorship bias

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Survivorship bias happens when we consider only surviving (i.e., existing) observations and fail to consider all other potential observations. This bias may result from focusing on only the successes of an evaluation but ignoring the failures or roadblocks that built the foundation for said success. That is, we may be prone to focus on people that start and finish a program, but neglect information from those that did not start or did not complete a program.

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