NMSE example 3.10
pf,          0
pd,       7081
test,         time,            max,            avg
if,         719300,              0,           -nan
id,    2.29347e+06,             63,        44.8311
of,         593055,              0,           -nan
od,    1.43377e+06,        61.9986,        5.14274
df,              0,              0
dd,        1.58496,            195