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find the f(x) in the least square method

  • 06-12-2011 6:23pm
    #1
    godwin
    Registered Users, Registered Users 2 Posts: 393 ✭✭


    Hi

    Just trying to remember how to find the f(x) in the least square method


    I have a big chart of data points but ill just provide the first

    x___y___x^2___x.y____f(x)
    -8__6.8__64____-54.4__?


    sorry for the format but this is the best I can do

    x= -8
    y= 6.8
    x^2 = 64
    x.y = -54.4
    f(x) = ?


Comments

  • #2
    bnt
    Registered Users, Registered Users 2 Posts: 13,077 ✭✭✭✭bnt


    Got an exam coming up? If so, you'll never need to remember it after that. You can just look it up if you ever need to do it by hand again. ;)

    See this page: you basically have to assemble two simultaneous equations from the various sums of the data, and solve them for the two parameters.

    You are the type of what the age is searching for, and what it is afraid it has found. I am so glad that you have never done anything, never carved a statue, or painted a picture, or produced anything outside of yourself! Life has been your art. You have set yourself to music. Your days are your sonnets.

    ―Oscar Wilde predicting Social Media, in The Picture of Dorian Gray



  • #3
    godwin
    Registered Users, Registered Users 2 Posts: 393 ✭✭godwin


    I cracked it , this was very useful

    http://www.zweigmedia.com/RealWorld/calctopic1/regression.html
    bnt wrote: »
    Got an exam coming up? If so, you'll never need to remember it after that. You can just look it up if you ever need to do it by hand again. ;)

    See this page: you basically have to assemble two simultaneous equations from the various sums of the data, and solve them for the two parameters.


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