Abstract
It is shown that analysis of the goodness of a fit using only the coefficient of determination R 2 or the mean average deviation is not enough and should be accompanied by a statistical study of the behavior of the residuals. This study should not be visual but using proper statistics. Different techniques such as normal probability plots, half-normal probability plots, detrended probability plots, rankits and Durbin–Watson are presented and illustrated with examples from the area of fluid behavior and fluid phase equilibrium.
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