[Blindmath] statistical formulas

[Kathy Roskos]

Thanks for the help.  I am really dense where math is concerned.  What 
exactly do you mean by the covariance?  Do I use deviation scores and figure 
the variances for both  X and Y and multiply them together?

I have read  that you can use raw scores or deviation scores to figure 
correlations.  Which method is easiest?

Kathy
Please excuse my ignorance.  I have  ----- Original Message ----- 
From: "Ryan Thomas" <rlt56 at nau.edu>
To: "Blind Math list for those interested in mathematics" 
<blindmath at nfbnet.org>
Sent: Tuesday, October 23, 2012 8:01 AM
Subject: Re: [Blindmath] statistical formulas


> For random variables X and Y, the correlation coefficient r is the
> covariance between x and y divided by the product of the variances of
> X and Y.  Depending on what statistics you're in there are other
> identities dealing with sum of squared regression and other terms.  I
> hope that's helpful though.
>
> On 10/23/12, Kathy Roskos <kroskos at cox.net> wrote:
>> I am new to this list.  I am taking a statistics class online and am 
>> having
>> trouble getting jaws to read the formulas.  Does anyone out there know 
>> about
>> calculating r values for correlational data?
>>
>> any advice would be appreciated.
>>
>> Kathy
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