• An important thing about USL

    From Ramine@21:1/5 to All on Tue Apr 12 15:39:14 2016

    We have to be smart please..

    If you take a look at the help file of the USL R package here:


    And if you take a look at this R program from Dr Gunther
    the author of USL:


    You will notice that they are using nonlinear regression
    to predict scalability, but when you are using
    nonlinear regression it can give different coefficients
    from those of the polynomial regression that gives the right
    coefficients, so this is a limitation in the nonlinear regression
    method, so i have implemented my USL programs using polynomial
    regression and this gives the right coefficients Alpha and Beta.

    So now i think that my USL programs are stable and more robust.

    You can download the new version 2.8 of my programs from:


    Thank you,
    Amine Moulay Ramdane.

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