NMSE example 3.6
pf,          0
pd,      50059
test,         time,            max,            avg
if,         744283,              0,           -nan
id,     2.1384e+06,        61.8841,        3.48591
of,         765551,              0,           -nan
od,    2.06474e+06,        61.6591,        17.0572
df,              0,              0
dd,        61.6591,          15038