Indicator Definition Units Range
Mean Bias (MB) MB ¼ 1N
$
PNi
¼1
ðPi MiÞa mg/m3 -N e N
Mean Error (ME) ME ¼ 1N
$
PNi
¼1
jPi Mi j mg/m3 0 e N
Normalized Mean Bias (NMB) NMB ¼ PNi
¼1
ðPi MiÞ=
PNi
¼1Mi % 100 e N
Normalized Mean Error (NME) NME ¼ PNi
¼1
jPi Mi j=
PNi
¼1Mi % 0e N
Pearson correlation coefficient (r) r ¼ ðPNi
¼1Pi$Mi N$P$MÞ=ðN 1Þ$sP$sM Dimensionless 1 e 1