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Math Help - How To Find "n" For Method Of Least Squares?

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    How To Find "n" For Method Of Least Squares?

    If you're given ANY set of points, how do you find n?

    In method of least squares, the formulas are:
    m(sum(xi^2)) + b(sum(xi)) = sum(xi * yi)
    m(sum(xi)) + nb = sum(yi)

    For example, how would you find n to do the method of least squares, if you're given these set of points?

    Eg.
    If you're given:
    (-3, 0.3)
    (-1, -1.1)
    (1, -1.9)
    (3, -3.2)
    (5, -3.7)

    is n delta x? or the number of x terms? etc. how do you find n?
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  2. #2
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    Quote Originally Posted by AlphaRock View Post
    If you're given ANY set of points, how do you find n?

    In method of least squares, the formulas are:
    m(sum(xi^2)) + b(sum(xi)) = sum(xi * yi)
    m(sum(xi)) + nb = sum(yi)

    For example, how would you find n to do the method of least squares, if you're given these set of points?

    Eg.
    If you're given:
    (-3, 0.3)
    (-1, -1.1)
    (1, -1.9)
    (3, -3.2)
    (5, -3.7)

    is n delta x? or the number of x terms? etc. how do you find n?
    n is the number of points, in this case n = 5.
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