The fractional bias is calculated for both the mean and

standard deviation of peak ozone values, as follows:

where

Fm = fractional bias of means

Fs = fractional bias of standard deviation

mo = mean maximum observed concentration

mp = mean peak predicted concentration

so = standard deviation of peak observed

concentrations

sp = standard deviation of peak predicted

concentrations

The means and standard deviations of predicted and observed

concentrations are determined by each of two methods:

Peak station values:

co(i,.) = maximum observed concentration at monitoring

station i across all hours

cp(i,.) = maximum predicted concentration at monitoring

station i across all hours

where i = 1,...,N monitoring stations

Peak hourly values:

co(.,j) = maximum observed concentration at hour j

across all monitoring stations

cp(.,j) = maximum predicted concentration at hour j

across all monitoring stations

where j = 1,...,H hours

The fractional bias of the mean and standard deviation

varies from -2 to +2. Negative values indicate overprediction

and positive values indicate underprediction.

 

 

n1201 - n1202 - n1203 - n1204 - n1205 - n1206 - n1207 - n1208 - n1209 - n1210 - n1211 - n1212 - n1213 - n1214 - n1215 - n1216 - n1217 - n1218 - n1219 - n1220 - n1221 - n1222 - n1223 - n1224 - n1225 - n1226 - n1227 - n1228 - n1229 - n1230 - n1231 - n1232 - n1233 - n1234 - n1235 - n1236 - n1237 - n1238 - n1239 - n1240 - n1241 - n1242 - n1243 - n1244 - n1245 - n1246 - n12247 - n1248 - n1249 - n1250

 

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