Subject: NLREG - Nonlinear & linear statistical regression program - 3 0418160005 ESD ** Announcing NLREG -- Nonlinear Statistical Regression Program ** http://www.sandh.com/sherrod/nlreg.htmlttp://www.netscape.commllows/ NLREG is a powerful statistical analysis program for Windows 95 and NT that performs linear and nonlinear regression analysis and curve fitting. NLREG determines the values of parameters for an equation, whose form you specify, that cause the equation to best fit a set of data values. NLREG can handle linear, polynomial, exponential, logistic, periodic, and general nonlinear functions. NLREG features a full programming language with a syntax similar to C for specifying the function that is to be fitted to the data. This allows you to compute intermediate work variables, use conditionals, and even iterate in loops. With NLREG it is easy to construct piecewise functions that change form over different domains. NLREG performs true nonlinear regression, it does not transform the function into a linear form. As a result, it can handle functions that are impossible to linearize such as: Y = Amplitude*SIN(Freq*X+Phase) + A*EXP(X); Another advantage of handing the function in true nonlinear form is that the minimization of the sum of squared residual values (i.e., "least squares") is based on the true nonlinear value rather than some linearized transformation. In addition to computing the optimal values of the parameters, NLREG can generate plots of the data points and the fitted equation. In addition, it can plot the distribution of residual values. In addition to performing classic nonlinear regression, NLREG can be used to find the root or minimum value of a general nonlinear function. It can also be used in a special form where the independent variable is omitted; an interesting application of this is "circular regression" where a circle is fitted to a set of data points. NLREG is in use at hundreds of universities, laboratories, and government agencies around the world (including the U.S. Navy, Harvard, and Duke). NLREG has been validated using the NIST statistical reference datasets; the results are available on the NLREG web page. The price of NLREG is only $65 ($70 if outside the USA), which is far below the cost of comparable commercial regression programs. And you can download a shareware demonstration version of NLREG to try out before you decide to purchase it. To learn more about NLREG and download your free shareware version, visit the web site: http://www.sandh.com/sherrod/nlreg.htmlttp://www.netscape.commllows/ -- 3: sci.stat.consult 0418160005 -- ------------------------------