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Math Help - Scoring system

  1. #1
    Newbie
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    Feb 2011
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    3

    Question Scoring system

    Hi,

    I'm creating a scoring system but I think the whole base of it is wrong and I don't know how to fix it.

    It's simple. There are 3 criteria: A, B and C. I will evaluate people in those 3 criteria and attribute points to it.

    Criteria A need to be 30% of total
    Criteria B need to be 40% of total
    Criteria C need to be 30% of total

    So what I do is attribute points and then multiple by 30% or 40% and then sum them all.
    The problem is that those criteria do not have the same amount of points.

    Criteria A can go from 0 to 6.
    Criteria B can go from 100 to 600.
    Criteria C can go from -2 to 2.

    So when I sum them, it doesn't make any sense. For example:

    John got 5 on A, 400 on B and 1 on C.
    So:
    A: 5*0.3 = 1.5
    B: 400*0.4 = 160
    C: 1*0.3 = 0.3
    Total: 161.8

    This way doesn't seem that criteria A is having the same importance of criteria B, or at least only 10% less importance.
    How can I make that work? Because it's impossible to have same scoring system for all criteria, but somehow the final score should reflect all criteria as almost equal.
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  2. #2
    MHF Contributor
    Joined
    Aug 2007
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    USA
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    2

    Re: Scoring system

    You do have to get them on a consistent scale. [0,1] often is used, but you can use [0,100] or [0,1000] if you like.

    A: Divide by 6 and then multiply by 0.30
    B: Subtract 100, Divide by 500, and then multiply by 0.40
    C: You tell me what you would use to accomplish the desired result.
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  3. #3
    Newbie
    Joined
    Feb 2011
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    Re: Scoring system

    Thanks! That solved my problem.
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