Error metric
# Error metric

An Error Metric is a type of Metric used to measure the error of a forecasting model. They can provide a way for forecasters to quantitatively compare the performance of competing models. Some common error metrics are:

* Mean Squared Error (MSE)
* Root Mean Square Error (RMSE)
* Mean absolute error (MAE)
* Mean Absolute Scaled Error (MASE)
* Mean Absolute Percentage Error (MAPE)
* Symmetric Mean Absolute Percentage Error (SMAPE)
