Author: L. Egghe 1
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  • 1 U.I.A. Universiteitsplein 1 B-2610 Wilrijk (Belgium) Universiteitsplein 1 B-2610 Wilrijk (Belgium)
  • 2 L.C.U. Universitaire Campus B-3610 Diepenbeek Belgium Universitaire Campus B-3610 Diepenbeek Belgium
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Abstract  

In a recent paper1Burrell shows that libraries with lower average borrowings tend to require a larger proportion of their collections to account for 80% of the borrowings, than those with higher average borrowings. In that study, the underlying frequency distribution was a negative binomial. We are dealing with a case when the underlying distribution is of Lotka type. It is also shown that the 80/20-effect is much stronger in this case.