110419 Linwood: Linear Least-Squares Curve Fitting Program Version: October 1979 Author: Fred Wood, Standard Oil Company, Chicago, IL Submitted by: David Zarnow, U.S. Naval Avionics Center, Indianapolis, IN Operating System: IAS V1.0+, RSX-11M V2.0+ Source Language: FORTRAN IV-PLUS Memory Required: 32K for 32K user partition Hardware Required: FP11 floating point unit Keywords: Statistics Abstract: The program has many options which allow the user to transform data into an appropriate form, fits specified equations to the transformed data by linear least-squares, and provides both statistics and plots to aid in evaluating the fit. A Cp-statistic search technique determines if smaller sets of the variables will represent the data equally well. The transformations which are available to the user include reciprocals, sums, differences, products, quotients, logarithms, and exponentials. In addition to the usual statistics, the program calculates the maximum and minimum value of each variable as well as its range, the relative influence of each variable, and the weighted squared standardized distance of each observation from the centroid of all observations. The program, as dimensioned, will handle up to 35 before transformations, 10 after, and 200 observations. Program change cards are included to allow a computer center to also offer two other programs, one which will handle up to 105 variables before transformations, 80 after, and 1000 observations; and the other which will handle up to 65 variables before transformations, 40 after, and 1000 observations. Multiple dependent variables are fitted one at a time, and multiple forms of specified linear equations can be fitted with one data loading. Media (Service Charge Code): User's Manual (EB), 600' Magnetic Tape (MA) Format: FILES-11

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