What would missing data do to the accuracy of a model?

Missing data would make a model inaccurate.

Missing data would make a model accurate.

Missing data would not affect a model’s accuracy.

Missing data would enhance a model’s accuracy.

2 answers

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I don't like any of the answers. Missing data doesn't affect the model, in my opinion. While missing data may affect the accuracy of a model's predicting capability, it doesn't affect the model itself.