where n is the total number of data points, pexp
CO2,i is the experimentally
measured CO2 partial pressure (kPa) and pmodel
CO2,i is the model
calculated CO2 partial pressure. The relative error rather than the
absolute error was used because the data varies over orders of
magnitude. For comparison with the work of others the agreement
between model calculated and measured data has been expressed
as the average absolute relative deviation as a percentage (AARD%).