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Math Help - Discriminant Analysis example in minitab

  1. #1
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    Discriminant Analysis example in minitab

    I am using minitab 15. I have checked minitab's help and on "Example of Discriminant Analysis" it shows some results generated by minitab after Discriminant analysis.

    I am confused about the following lines
    Linear Discriminant Function for Groups

    Alaska Canada
    Constant -100.68 -95.14
    Freshwater 0.37 0.50
    Marine 0.38 0.33

    can anybody explain me or state the discriminant function using these numbers and what these numbers mean or what these numbers explain us..?

    Thanks,
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  2. #2
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    Quote Originally Posted by ahmirf View Post
    I am using minitab 15. I have checked minitab's help and on "Example of Discriminant Analysis" it shows some results generated by minitab after Discriminant analysis.

    I am confused about the following lines
    Linear Discriminant Function for Groups

    Alaska Canada
    Constant -100.68 -95.14
    Freshwater 0.37 0.50
    Marine 0.38 0.33

    can anybody explain me or state the discriminant function using these numbers and what these numbers mean or what these numbers explain us..?
    The spacing in your message makes it hard to see, so...

    Class: "Alaska"
    Constant -100.68
    Freshwater 0.37
    Marine 0.38

    Class: "Canada"
    Constant -95.14
    Freshwater 0.50
    Marine 0.33

    These are coefficients for a pair of linear discriminant functions. These functions are used to make predictions about future cases. For any new case, calculate both discriminant functions, as the constant plus Freshwater times its coefficient plus Marine times its coefficient. Whichever class has the larger discriminant score, is the predicted class.


    -Will Dwinnell
    Data Mining in MATLAB
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