Assessing and Interpreting The Accuracy of Effort Estimates
The most common measure of the average estimation accuracy is the MMRE (Mean Magnitude of Relative Error), where the MRE of each estimate is defined as:
MRE =
This measure has been criticized and there are several alternative measures, such as more symmetric measures, Weighted Mean of Quartiles of relative errors (WMQ) and Mean Variation from Estimate (MVFE).
A high estimation error cannot automatically be interpreted as an indicator of low estimation ability. Alternative, competing or complementing, reasons include low cost control of project, high complexity of development work, and more delivered functionality than originally estimated. A framework for improved use and interpretation of estimation error measurement is included in.
Read more about this topic: Software Development Effort Estimation
Famous quotes containing the words interpreting, accuracy, effort and/or estimates:
“Drawing is a struggle between nature and the artist, in which the better the artist understands the intentions of nature, the more easily he will triumph over it. For him it is not a question of copying, but of interpreting in a simpler and more luminous language.”
—Charles Baudelaire (1821–1867)
“As for farming, I am convinced that my genius dates from an older era than the agricultural. I would at least strike my spade into the earth with such careless freedom but accuracy as the woodpecker his bill into a tree.”
—Henry David Thoreau (1817–1862)
““... There, there,
What you complain of, all the nations share.
Their effort is a mounting ecstasy
That when it gets too exquisite to bear
Will find relief in one burst. You shall see.
That’s what a certain bomb was sent to be.””
—Robert Frost (1874–1963)
“A State, in idea, is the opposite of a Church. A State regards classes, and not individuals; and it estimates classes, not by internal merit, but external accidents, as property, birth, etc. But a church does the reverse of this, and disregards all external accidents, and looks at men as individual persons, allowing no gradations of ranks, but such as greater or less wisdom, learning, and holiness ought to confer. A Church is, therefore, in idea, the only pure democracy.”
—Samuel Taylor Coleridge (1772–1834)