TY - JOUR
AU - Dastidar, Surajit Ghosh
PY - 2006/04/13
Y2 - 2022/11/30
TI - Gompertz: A Scilab Program for Estimating Gompertz Curve Using Gauss-Newton Method of Least Squares
JF - Journal of Statistical Software
JA - J. Stat. Soft.
VL - 15
IS - 12
SE - Articles
DO - 10.18637/jss.v015.i12
UR - https://www.jstatsoft.org/index.php/jss/article/view/v015i12
SP - 1 - 12
AB - A computer program for estimating Gompertz curve using Gauss-Newton method of least squares is described in detail. It is based on the estimation technique proposed in Reddy (1985). The program is developed using Scilab (version 3.1.1), a freely available scientific software package that can be downloaded from http://www.scilab.org/. Data is to be fed into the program from an external disk file which should be in Microsoft Excel format. The output will contain sample size, tolerance limit, a list of initial as well as the final estimate of the parameters, standard errors, value of Gauss-Normal equations namely GN<sub>1</sub> GN<sub>2</sub> and GN<sub>3</sub>, No. of iterations, variance(σ<sup>2</sup>), Durbin-Watson statistic, goodness of fit measures such as R<sup>2</sup>, D value, covariance matrix and residuals. It also displays a graphical output of the estimated curve vis a vis the observed curve. It is an improved version of the program proposed in Dastidar (2005).
ER -