OOPS! Correction! see second line below
another way to phrase that is
for each case find x = (X- X_Xbar) and y = (Y - Ybar)
then multiply x*y (this is called a cross-product).
then find the sum of the crossproducts.
Xbar is x with a bar over it i.e., the mean
There is a set of parens implici
"janne" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> How do I do the first (X-X(with a line above))? I have tried to take
> _
>X-X
*snip*
> 0
> As you see the answer is zero. What do I do wrong?
You calculate
SUM[(x-x_bar)] * SUM[(y-y_bar)]
sum of deviations around a mean always = 0
>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
In sci.stat.consult janne <[EMAIL PROTECTED]> wrote:
: 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
If you don't know with x(with a line above) MEANS, you need to STUDY your
text. Also your instructo
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another way to phrase thatis
for each case find x= X_XBAR and y = YBAR
then multiply x*y (this is called a cross-product).
then find the s
"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:
> xy
> 1 68
> 2 91
> 3 102
> 3 107
> 4 105
In article <[EMAIL PROTECTED]>,
janne <[EMAIL PROTECTED]> wrote:
>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:
[example omitted]
>As you see the answer is zero. What do I do wrong?
Nothing. F
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:
xy
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 proble
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:
xy
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 proble
