Fig. 18
![Fig. 18](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12879-017-2365-1/MediaObjects/12879_2017_2365_Fig18_HTML.gif)
Comparison of MAPE and sMAPE domains and ranges spectrum: Red borders in the left graph (a) belong to predicted curves x(t)=2×y(t) and x(t)=0×y(t) with MAPE = 1 and the red borders in the right chart (b) corresponds to x(t)=3×y(t) and x(t)=(1/3)×y(t) which generate sMAPE = 1. The black borders in graphs c & d are corresponding to predicted epidemic curves which generates MAPE=2 and sMAPE =2 in the left and right charts sequentially