Walter D. Fisher

On Grouping for Maximum Homogeneity

Abstract Given a set of arbitrary numbers, what is a practical procedure for grouping them so that the variance within groups is minimized? An answer to this question, including a description of an automatic computer program, is given for problems up to the size where 200 numbers are to be placed in 10 groups. Two basic types of problem are discussed and illustrated. * This paper is the result of work supported by the Social Science Research Council and by the Bureau of General Research of Kansas State College; also by the courtesies extended to the author by the University of Illinois when he visited there during the summer of 1956. The author gratefully acknowledges the helpful suggestions he received from W. A. Neiswanger, Kern Dickman, and D. B. Gillies of the University of Illinois; from J. I. Northam, now with the Upjohn Company; and from Henry Tucker, now of the University of Arizona.

A Note on Curve Fitting with Minimum Deviations by Linear Programming

Abstract For some time it has been well known among specialists in mathematical programming that the statistical problem of fitting a linear multiple regression with the criterion of minimizing the sum of absolute deviations from the regression function (rather than squared deviations) may be reduced to a linear programming problem. But this knowledge seems not widespread among general statisticians.1 This note briefly reviews the formulation of this application of linear programming, and its history.

Electrocnic computation of human diets

Reading is a hobby to open the knowledge windows. Besides, it can provide the inspiration and spirit to face this life. By this way, concomitant with the technology development, many companies serve the e-book or book in soft file. The system of this book of course will be much easier. No worry to forget bringing the electronic computation of human diets book. You can open the device and get the book by on-line.

Clustering and Aggregation in Economics.

Bargaining with reading habit is no need. Reading is not kind of something sold that you can take or not. It is a thing that will change your life to life better. It is the thing that will give you many things around the world and this universe, in the real world and here after. As what will be given by this clustering and aggregation in economics, how can you bargain with the thing that has many benefits for you?