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Math Help - Kruskal wallis

  1. #1
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    Kruskal wallis

    Hey,
    Can someone please help me with the rang:

    typ 1 (r)
    100 (13)
    96 (9)
    92 (6)
    96 (9)
    92 (6,5)

    typ2 (r)
    76 (2)
    80 (3,5)
    75 (1)
    84 (5)
    80 (3,5)

    typ3 (r)
    108 (15)
    100 (13)
    96 (9)
    98 (11)
    100 (13)


    My question, is how you do when its 3 of the same. I would do like above.
    Thank for your help!
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  2. #2
    Super Member ILikeSerena's Avatar
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    Re: Kruskal wallis

    Hi emme!

    I don't understand your question.
    Can you elaborate?

    You have a series of scores in 3 groups that have already been ranked.
    The lowest number has rank 1, and the highest number has rank 15.
    All that is left, is to fill in the numbers in the formula for the test statistic.
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  3. #3
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    Re: Kruskal wallis

    Hey,
    Sorry... yes I have 3 groups and I want to rank them, I did the rank but Im not sure its right because I dont know how you rank them when you have the score 100, 3 times.
    Thanks for your help!
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  4. #4
    Super Member ILikeSerena's Avatar
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    Re: Kruskal wallis

    Ah yes, score 100 would get ranks 12, 13, and 14.
    Since it is a tie, each gets the average of these ranks, which is 13.
    And that's what you did! Good!
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  5. #5
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    Re: Kruskal wallis

    Are you sure? Haha.
    So I did the score right? And 80, 2 of them gets 3,5 and 96 gets 9?

    Thank you for the help!!
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  6. #6
    Super Member ILikeSerena's Avatar
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    Re: Kruskal wallis

    Yes!

    Erm... however, I see you assigned 92, which occurs 2 times, 6 respectively 6,5.
    That's not right!
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  7. #7
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    Re: Kruskal wallis

    Yeah, you're right, I missed that one here... so 92 is 6,5 on both. Except for that, its right?
    So if you do a Kruskal test it will be:
    k= 12/15(15+1) (44^2/5+15^2/5+61^2)-3(15+1) = 10,82 ?

    If thats right, that will make my day!
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  8. #8
    Super Member ILikeSerena's Avatar
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    Re: Kruskal wallis

    Consider your day made.
    You get my stamp of approval!
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  9. #9
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    Re: Kruskal wallis

    ..and then you compare it to a chi critical and reject the Ho: u1=u2=u3.
    Haha, I had that question on my exam today and my friends didn't do it like I did, so I thought I was wrong and wanted to check it with you smart guys
    Thanks a lot!
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  10. #10
    Super Member ILikeSerena's Avatar
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    Re: Kruskal wallis

    Erm... my thanks count is still a bit low.
    Would you mind increasing it a bit?
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  11. #11
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    Re: Kruskal wallis

    Haha, I'll do it when I get the result and I can be 100% sure
    Thanks, gracias, merci, obrigada, tack!
    Have a good day!
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  12. #12
    Super Member ILikeSerena's Avatar
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    Re: Kruskal wallis

    Ah, but even when you get the results, you can only be about 95% sure.
    That's just how statistics works!
    CU!
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  13. #13
    Super Member ILikeSerena's Avatar
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    Re: Kruskal wallis

    Well...?
    Did you get the result yet?
    Are you 100% sure now?
    Thanks from emme1
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  14. #14
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    Re: Kruskal wallis

    Quote Originally Posted by ILikeSerena View Post
    Ah, but even when you get the results, you can only be about 95% sure.
    That's just how statistics works!
    CU!
    not really you can adjust to 99%, which software you use for statical analysis, I use statgraphics with 99%

    Sydney App Fest
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