TABLE 4. Average Mean Absolute Percentage Errors (MAPEs) of the Forecasts of the Epidemic Evolution in the USA, Obtained With the Proposed Algorithm, and With the SIR-Fit and GSEIR-Fit Curve-Fitting Approaches, for Different Forecast Horizons, That is, 3, 7, and 14 Days. The Uppermost Table Reports the Average MAPEs Computed Over the Interval From March 10 to July 17; the Lowermost Table Reports the Average MAPEs Computed Over the Interval From April 1 to July 17.

Algorithm	3 Days (%)	7 Days (%)	14 Days (%)
Proposed	7.3	11.9	29.8
SIR-fit	81.6	122.4	232.4
GSEIR-fit	14.0	20.0	35.2
Average over the interval from March 10 to July 17
Algorithm	3 Days (%)	7 Days (%)	14 Days (%)
Proposed	3.4	4.5	7.2
SIR-fit	91.4	138.8	267.6
GSEIR-fit	12.1	17.0	28.7
Average over the interval from April 1 to June 17