How Accurate is an Effort Model?

How Accurate is an Effort Model?

Emilia Mendes (University of Auckland, New Zealand)
Copyright: © 2008 |Pages: 16
DOI: 10.4018/978-1-59904-135-3.ch003
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Abstract

Building effort models or using techniques to obtain a measure of estimated effort does not mean that the effort estimates obtained will be accurate. As such, it is also important and necessary to assess the estimation accuracy of the effort models or techniques under scrutiny. For this, we need to employ a process called cross-validation. Cross-validation means that part of the original data set is used to build an effort model, or is used by an effort estimation technique, leaving the remainder of the data set (data not used in the model-building process) to be used to validate the model or technique. In addition, in parallel with conducting cross-validation, prediction accuracy measures are also obtained. Examples of de facto accuracy measures are the mean magnitude of relative error (MMRE), the median magnitude of relative error (MdMRE), and prediction at 25% (Pred[25]).

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Table of Contents
Acknowledgments
Emilia Mendes
Chapter 1
Emilia Mendes
The objective of this chapter is threefold. First is to introduce new terminology that relates specifically to hypertext, the model the Web is based... Sample PDF
What is Different about Web and Software Projects?
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Chapter 2
Emilia Mendes
Software effort models and effort estimates help project managers allocate resources, control costs, and schedule and improve current practices... Sample PDF
Introduction to Web Cost Estimation
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Chapter 3
Emilia Mendes
Building effort models or using techniques to obtain a measure of estimated effort does not mean that the effort estimates obtained will be... Sample PDF
How Accurate is an Effort Model?
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Chapter 4
Sizing Web Applications  (pages 78-119)
Emilia Mendes
Surveying and classifying previous work in a particular field brings several benefits, which are to (a) help organise a given body of knowledge, (b)... Sample PDF
Sizing Web Applications
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Chapter 5
Emilia Mendes
Software effort models and estimates help project managers allocate resources, control costs, and schedule and improve current practices, leading to... Sample PDF
Web Effort Estimation Usiing Regression Analysis
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Chapter 6
Emilia Mendes
Software practitioners recognise the importance of realistic effort estimates to the successful management of software projects, the Web being no... Sample PDF
Web Effort Estimation Using Case-Based Reasoning
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Chapter 7
Emilia Mendes
The use of realistic effort estimates is fundamental to both software and Web project management as they help project managers allocate resources... Sample PDF
Web Effort Estimation Using Classification and Regression Trees
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Chapter 8
Emilia Mendes
Although numerous studies on Web effort estimation have been carried out to date, there is no consensus on what constitutes the best effort... Sample PDF
What is the Best Technique?
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Chapter 9
Emilia Mendes
Numerous Web development companies worldwide do not employ formal techniques to estimate effort for new projects, thus relying on expert-based... Sample PDF
How to Improve Your Company's Effort Estimation Practices
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Chapter 10
Emilia Mendes
The objective of this chapter is to provide an introduction to statistical techniques and concepts that are frequently used when dealing with data... Sample PDF
Understanding Project Data
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Chapter 11
Emilia Mendes
The objective of this chapter is to motivate the need for empirical investigations in Web engineering, and additionally to describe the three main... Sample PDF
The Need for Empirical Web Engineering: An Introduction
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About the Author