What are the Metrics used to Evaluate the performance of Regression Models in ML DM by Mahesh Huddar

What are the Metrics used to Evaluate the performance of Regression Models in Machine Learning Data Mining by Mahesh Huddar

The following concepts are discussed:
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Mean Absolute Error (MAE) in regression,
Mean Squared Error (MSE) in regression,
Root Mean Square Error (RMSE) in regression,
Relative MSE in regression,
Coefficient of Variation in regression

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[tamannakhan]

Why we just cannot use difference between actual value and predicted value?