00761naa a2200145 a 450000100080000000500110000800800410001910000170006024501020007726000090017952003380018865300170052665300200054377300520056318345952013-07-30       1981    bl ---       0--  u    #d1 aHAYES, R. M.  aThe distribution of use of library materialsbanalysis of data from the University of Pittsburgh.  c1981  aEvaluates the validity of using circulation data as the index to the total utilization of a library collection and tests the hypothesis that the proposed mixture of Poisson distributions can describe and predict various use distribution. Seven statistical analysis listings, six algorithms, 20 tables, and 43 references are provided.  aBibliometria  aBiblioteconomia  tLibrary Researchgv. 3, n. 3, p. 215-260, 1981.