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The Study nn Using Computer-Aided Regression Analysis to Determine the Qptimal Collection Copy Number

??Taking cases as objects for investigation, the paper paints that the distribution of copy nurnber of the different collections in libraries not only is possessed of a certain law, but also exists in some relativity with the number of user needs. And, by the help of computer-aided regression analysis, it indicates that there is a positive correlation Meanwhile, based on the statistics analysis of refused rates, it finds that there is a monadic curve f hyperbola regrcssian relationship between the refused rakes and the collection copy number. 50, on the principle of the biggest point of curvature of hyperbola. which divides refused rates in high and low revns, the optimal collection copy number and theory refused rates have tteen obtained by the authors in the calculation of coordinates of the biggest point of curvature.