sirad (version 2.3-1)

modeval: Model performance statistics.

Description

Function estimates several statistics comparing modelled and reference (measured) values.

Usage

modeval(calculated,measured,
stat=c("N","pearson","MBE","RMBE","MAE","RMAE","RMSE","RRMSE","R2","slope",
"intercept","EF","SD","CRM","MPE","AC","ACu","ACs"),minlength=4)

Arguments

calculated

Vector of length n of the calculated (modelled) values.

measured

Vector of length n of the reference (measured) values.

stat

Statistics which are going to be calculated. By default all possible.

minlength

Minimum number of non-NA data pairs. If below this value, the NA's are produced.

Value

List of 13 statistics:

N

number of observations

person

Pearson's Correlation Coefficient

MBE

Mean (Bias) Error

RMBE

Relative Mean (Bias) Error

MAE

Mean Absolute Error

RMAE

Relative Mean Absolute Error

RMSE

Root Mean Square Error

RRMSE

Relative Root Mean Square Error

R2

Coefficient of determination from linear model

slope

Slope from linear model

intercept

Intercept from linear model

EF

Modelling Efficiency

SD

Standard deviation of differences

CRM

Coefficient of Residual Mass

MPE

Mean Percentage Error

AC

Agreement Coefficient

ACu

Unsystematic Agreement Coefficient

ACs

Systematic Agreement Coefficient

Details

The two input vectors can include NA's. Only non-NA calculated-mesured pairs are used. See 'na.omit' for details.

References

Bellocchi, G., Acutis, M., Fila, G., Donatelli, M., 2002. An indicator of solar radiation model performance based on a fuzzy expert system. Agronomy Journal 94, 1222-1233. Ji, L., Gallo, K., 2006. An Agreement Coefficient for image comparison. Photogrammetric Engineering & Remote Sensing 72(7), 823-833.

Examples

data(Metdata)
B <- 0.11
tmax <- Metdata$meteo$TEMP_MAX
tmin <- Metdata$meteo$TEMP_MIN
days <- Metdata$meteo$DAY
lat <- Metdata$LATITUDE
solrad_measured <- Metdata$meteo$RAD_MEA
solrad_BC <- bc(days, lat, extraT=NULL, BCb=B, tmax, tmin, BCc=2, tal=0.76) 

modeval(solrad_BC,solrad_measured)
modeval(solrad_BC,solrad_measured,stat="EF")