“…Finally the 80/20 rule, or more generally, the 80/100x rule, or even 1000/100x rule; 0 < x < 1, 0 < 6 < 1 (Britten, 1990;Burrell, 1985;Egghe, 1986;Mankin & Bastille, 1981), is nothing but a different mathematical description of the Lorenz curve.…”
Section: A Heuristic Explanation: a Positive Reinforcement Model Betwmentioning
A mathematical model is proposed to explain the observed concentration (or diversity) in two distributions of nominal classes. We tentatively pose that the model is valid when: (1) there is a cause-effect relationship between the items in the distributions under consideration; and (2) there is a positive reinforcement between the occurrence of items in the second and in the first distribution.
“…Finally the 80/20 rule, or more generally, the 80/100x rule, or even 1000/100x rule; 0 < x < 1, 0 < 6 < 1 (Britten, 1990;Burrell, 1985;Egghe, 1986;Mankin & Bastille, 1981), is nothing but a different mathematical description of the Lorenz curve.…”
Section: A Heuristic Explanation: a Positive Reinforcement Model Betwmentioning
A mathematical model is proposed to explain the observed concentration (or diversity) in two distributions of nominal classes. We tentatively pose that the model is valid when: (1) there is a cause-effect relationship between the items in the distributions under consideration; and (2) there is a positive reinforcement between the occurrence of items in the second and in the first distribution.
“…Having said that, Britten's use of the 80/20 rule (Britten, 1990), which demonstrated that within the University of Tennessee at Knoxville Library the idea that 20% of the material accounts for 80% of use, presents a general relationship that can be used in assessing a collection. Britten's conclusion at UT Knoxville resulted in a range of 1.5% to 40.0% of the material purchased accounted for 80% of the circulation (with an average of 21.3% of the new material accounting for 80% of the circulation).…”
Section: Results and Discussion Of What Was Collectedmentioning
With a growing interest in evaluating the effectiveness of libraries, it is increasingly important that libraries find efficient ways to evaluate the collection development and acquisitions process. This requires a dual approach to explore both what was collected and actually used and also what was not collected which should have been. This study presents a way that both of these areas can be studied for smaller academic libraries and suggests ways these results can be interpreted and used to reallocate scarce budgetary resources or provide evidence for more funds for further developing the collection.
“…In particular Kuhlthau (1991) argued that the demand for a resource is largely influenced by external and internal factors that direct the user toward the decision to borrow or not borrow a particular item. This can be interpreted through the Pareto distribution-inspired axiom of the 80/20 rule, in which 20% of collection items accounts for 80% of loans (Britten, 1990;Burrell, 1985;Koch, 1998;Nisonger, 2008;Trueswell, 1969); items are divided according to their popularity. Although the 80/20 rule provides an easy and understandable way of characterizing the popularity of collection items, its crisp definition creates a disadvantage for its interpretation.…”
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