Question: 1-Why we use absolute error instead of calculating negative or positive error 2-Why in MSE we square error, and why we divide error by Friderich

1-Why we use absolute error instead of calculating negative or positive error
2-Why in MSE we square error, and why we divide error by Friderich Bessel n-1 instead of n.
3-Which of MAD, MSE or MAPE do we use in forecasting?

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