Nothing

```
errorMetric <- function(obs, forec, type="sAPE", statistic="M"){
if( !any(type==c("AE","SE","APE","sAPE")) ) stop("Error in errorMetric function: this error type has not been implemented.")
if( !any(statistic==c("M","Md","N")) ) stop("Error in errorMetric function: this statistic has not been implemented.")
if( is.ts(obs) || is.ts(forec) ){
obs = as.numeric(obs)
forec = as.numeric(forec)
}
obs = as.matrix(obs)
forec = as.matrix(forec)
if(any(dim(obs)!=dim(forec))) stop("Error in errorMetric function: the dimensions of the vectors are different.")
if(type == "AE")
errors = abs(obs - forec)
if(type == "SE")
errors = (obs - forec)^2
if(type == "APE")
errors = abs( 100*(obs - forec)/obs )
if(type == "sAPE")
errors = abs( 200*(obs - forec)/(abs(obs) + abs(forec)) )
if(statistic == "M")
return( mean(errors, na.rm=TRUE) )
if(statistic == "Md")
return( median(errors, na.rm=TRUE) )
return( errors )
}
```

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