APPENDIX C

PERFORMANCE MEASURE FORMULATIONS

RECOMMENDED PERFORMANCE MEASURES

1. Unpaired Highest-Prediction Accuracy (Au)

where

Au = unpaired highest-prediction accuracy

(quantifies the difference between the

magnitude of the highest 1-hour observed

value and the highest 1-hour predicted value

co(.,.) = maximum 1-hour observed concentration over

all hours and monitoring stations

cp(.,.) = maximum 1-hour predicted concentration over

all hours and surface grid squares

2. Normalized Bias Test (D*)

where

D* = normalized bias obtained from all hourly

prediction-observation pairs

N = number of monitoring stations

Hi = number of hourly prediction-observation pairs

for monitoring station i

NT = total number of station-hours

co(i,j) = observed value at monitoring station i for

hour j

cp(i,j) = predicted value at monitoring station i for

hour j

3. Gross Error of All Pairs >60 ppb (Ed*)

 

 

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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