"janne" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> I have a correlation formula I don't get to work. And we must use this
> formula on the test. Let me give you an example: Let's say X and Y
> are:
> x y
> 1 68
> 2 91
> 3 102
> 3 107
> 4 105
> 4 114
> 5 115
> 6 127
> _ ___
> 28 829
> _ _
> X is =3.5 and Y is =103.625
>
> Now to my problem. Look at the formula in this URL:
> http://www.jannesgallery.com/corr.html.
> How do I do the first (X-X(with a line above))? I have tried to take
> _
> X-X
> 1-3.5=2.5
> 2-3.5=-1.5
> 3-3.5=-0.5
> 3-3.5=-0.5
> 4-3.5=0.5
> 4-3.5=0.5
> 5-3.5=1.5
> 6-3.5=2.5
> ________
> 0
>
>
>
> As you see the answer is zero. What do I do wrong? and the same with
> Y-Y(with a line above). It turns out to be zero. Please help me to tell
> how I should do.
>
> Janne
>
The sum is:
(1-3.5)*(68-103.625) + (2-3.5)*(91-103.625) + ... + (6-3.5)*(127-103.625)
which, in general, will not be zero.
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