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  • NLREG is in use at hundreds of universities, laboratories, and government agencies around the world (over 20 countries). For a list of a few organizations using NLREG click here.

  • If you have categorical variables, you may want to use a Decision Tree to model your data. Check out the DTREG Decision Tree Builder.

  • You also should check out the News Rover program that automatically scans Usenet newsgroups, downloads messages of interest to you, decodes binary file attachments, reconstructs files split across multiple messages, and eliminates spam and duplicate files.

    Fit An Asymptotic Function

    An asymptotic function increases or decreases until it approaches some fixed value (i.e., the asymptote) at which point it levels off. The form of an asymptotic function is:

    y = a + b/x

    where a and b are parameters whose values are to be computed by the fitting process. Here are the NLREG statements to fit this function:

    Title "Asymptotic function:  Y = a + b/X";
    Variables X,Y;            // Two variables: x and y
    Parameters a,b;           // Two parameters to estimate: a and b
    Function Y = a + b/X;     // Equation to be fitted to data
    Plot;                     // Plot equation and data with grid lines
    [ data goes here ]

    Here is a plot generated by NLREG showing the function fitted to a a set of values.

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