A Cost Analysis Curve-Fitting Program
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Describes a FORTRAN-IV curve-fitting computer program (CURVES) that makes least-squares determinations of the parameters of any of eight types of equations selected by the user, given a set of observations on the dependent and independent variables of interest. The types of equations that can be fitted are: linear, quadratic, power, asymptotic-power, exponential, logarithmic-linear, and two types of semilogarithmic-linear. Except for the quadratic and asymptotic-power equations, up to seven independent variables may be used. Y-intercepts may be specified for all equations except the power and exponential. Various types of variable transformations are allowed. correlation matrix of the input data is provided for all fitted equations using more than one independent variable. Also included are standard errors and Student's t-ratios of the parameters, significance levels, beta coefficients, the Durbin-Watson statistics, and the variance-covariance matrix of the parameters. A plot routine is also incorporated. The program is fairly small (about 92,000 bytes of core when H compiled), fast in execution time, and hence cheap to operate.
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