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Thread: Regression Analysis Non linear estimation using squares

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    Regression Analysis Non linear estimation using squares




    Hi,
    I have used Gompertz model to estimate an equation.
    I have followed these two sites they explain it all.

    http://www.weibull.com/RelGrowthWeb/...st_squares.htm
    http://www.fao.org/DOCREP/006/X8498E/x8498e0e.htm

    This method uses squares to approximate the equation.

    Following from first site because the variables are different names.

    I have calculated Y=((A*B)**C)**X

    ** means to the power of
    anyways further down I have calculated G(0), Y(0), and D(0)

    Problem:

    I am currently calculating ^V(0) = (D(0)T * D(0))**-1) * D(0)T * Y(0)
    T means Transpose D(0)
    **-1 means inverse


    Now this equation uses matricies to solve for ^V(0)
    I have multiplied this sucessfully (D(0)T * D(0))**-1) * D(0)T
    but this gives a 3 x 3 matrix in my result
    and Y(0) is 1x6 matrix.
    Obviously cannot multiply these 2 matricies.
    In the example they dont elaborate on the example for this equation.
    Can someone please tell me what am I doing wrong?

  2. #2
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    Dont worry I have solved the problem.

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