Notations Used in the Formulas

To understand the formulas for the statistics of fit, review the following conventions.

• n is the number of nonmissing observations.
• k is the number of fitted parameters in the model.
• h is the length of the forecasta numerical prediction of a future value for a specified time period for each unique combination of BY variable values region.
• denotes the actual value of the dependent variable at time t.
• denotes the forecasted (predicted) value of the dependent variable at time t
• is the absolute percent error.
• is the absolute symmetric percent error.
• is the absolute predictive percent error.
• is relative absolute error.