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One of the problems in software cost estimation is how to evaluate estimation models. Estimation models are usually evaluated against two attributes: estimation accuracy and estimation consistency. A number of measures are reported in the literature, but they have shortcomings. There is no generally accepted standard to evaluate estimation models and the existing measures sometimes are not consistent among themselves. This paper examines existing measures of estimation accuracy and consistencydoi:10.3127/ajis.v5i1.348 fatcat:wr3k6y4wpbh3fk5umafocaff54