the quantiles state that a certain percentage of the absolute error(68.3% and 95%) is found in a certain rang of values. the normalized median absolute deviation(nmad) is proportional to the median of the absolute differences between errors and median error. it generate a value similar to the standard deviation but more resilient to outliers. the measures above help to describe and compare the properties of the accuracy assessment. in order to state traditional accuracy measures the 3*rmse is applied but for the robust measures the entire dataset including the outliers is assessed.