relmse.R
relmse = function(forecast, forecastbench, true)
{
if (length(forecast) != length(true))
stop("RelMAE: the lengths of input vectors must be the same.")
ferror = ftsa:::mse(forecast, true)
ferrorbench = ftsa:::mse(forecastbench, true)
relativerror = ferror / ferrorbench
return(round(relativerror, 6))
}