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

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lou p lou
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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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mikesgt2
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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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mikesgt2
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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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Specialheffa
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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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Specialheffa
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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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sspllr
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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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viviki
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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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mikesgt2
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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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lou p lou
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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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