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Stats coursework (need help- i can't remember an equation i need) watch

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    is nasty and boring and horrid.

    i'm doin my Alevel stats coursework and it's the most boring thing ever. i have one problem though- i've lent my S1 notes to a friend who is resitting it and i can't remember the PMCC equation. can anyone help please- they will get some of my plentiful rep.

    lou xxx
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    (Original post by lou p lou)
    is nasty and boring and horrid.

    i'm doin my Alevel stats coursework and it's the most boring thing ever. i have one problem though- i've lent my S1 notes to a friend who is resitting it and i can't remember the PMCC equation. can anyone help please- they will get some of my plentiful rep.

    lou xxx
    Is it:

    PMCC = (Sxy)/(Sxx * Syy)
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    (Original post by mikesgt2)
    Is it:

    PMCC = (Sxy)/(Sxx * Syy)
    I have attatched the definitions of Sxy, Sxx, Syy
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    PMCC (r) = Sxy
    -----------------------------------
    Square root SxxSyy

    So thats Sxy divided by the square root of (Sxx)(Syy)

    Hope this is ok.

    Ta
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    (Original post by mikesgt2)
    I have attatched the definitions of Sxy, Sxx, Syy
    you have to square root SxxSyy and then divide Sxy by that answer.
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    (Original post by lou p lou)
    is nasty and boring and horrid.

    i'm doin my Alevel stats coursework and it's the most boring thing ever. i have one problem though- i've lent my S1 notes to a friend who is resitting it and i can't remember the PMCC equation. can anyone help please- they will get some of my plentiful rep.

    lou xxx
    yeh that is it n remember sxy = sum of xy - (sum of x)(sum of y)
    ------------------
    n

    sxx = sum of x^2 - (sum of x)^2
    -------------
    n

    syy = sum of y^2 - (sum of y)^2
    ------------
    n
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    Well I havent got a clue about maths but i did a web search it looks like a useful site anyway

    http://www.mathsnet.net/asa2/modules/s14calcpmcc.html
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    (Original post by Specialheffa)
    you have to square root SxxSyy and then divide Sxy by that answer.
    Yeah, sorry. I was doing it from memory and I havn't touched stats since I took S1 in the summer.
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    (Original post by sspllr)
    yeh that is it n remember sxy = sum of xy - (sum of x)(sum of y)
    ------------------
    n

    sxx = sum of x^2 - (sum of x)^2
    -------------
    n

    syy = sum of y^2 - (sum of y)^2
    ------------
    n
    cheers, that's great- i couldn't remember what Sxy etc. were.

    lou xxx
 
 
 
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