Gbarry boehm’s estimation model and the basic cocomo model
#Gbarry boehm’s estimation model and the basic cocomo model software
The Intermediate COCOMO model computes software development effort as a function of program size and a set of "cost drivers" that include subjective assessments of product, hardware, personnel and project attributes. The Basic COCOMO model is a static, single-valued model that computes software development effort (and cost) as a function of program size expressed in estimated lines of code (LOC). The hierarchy of COCOMO models takes the following form: The model parameters are derived from fitting a regression formula using data from historical projects. The COCOMO model: The Constructive Cost Model (COCOMO) is a procedural software cost estimation model developed by Barry W. Where A, B and C are empirically derived constants, E is the effort in person-months, and ev is the estimation variable.Į = 5.2 * ( KLOC )0.91 Walston-Felix modelĮ = 5.5 + 0.73 * ( KLOC )1.16 Bailey-Basili modelĮ = 3.2 * ( KLOC )1.05 Boehm simple modelĮ = -13.39 + 0.0545 * FP Albrecht and Gaffney modelĮ = 60.62 * 7.728 * 10-8 * FP3 Kemerer modelĮ = 585.7 + 15.12 FP Matson, Barnett, Mellichamp
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The structure of such models takes the form
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The structure of estimation models: A typical estimation model is derived using regression analysis on data collected from past projects.
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The empirical data that support most estimation models are derived from a limited sample of projects. An estimation model for computer software uses empirically derived formulas to predict effort as a function of LOC and FP.