Re: correlation _ Pearson

thanks for your answer.
I want o see if the dep. var (Y) is correlated with the others indep. var
(X1.. X5), also I want to determine if there is a multicollinearity between
these var (X1 .. X5).
"Paige Miller" <pmiller5NOSPAM@xxxxxxxxxxxxxxxx> a écrit dans le message de
news: iP3Gf.7411$bU6.7254@xxxxxxxxxxxxxxxxxxxxxxx
On 2/7/2006 2:02 AM, Thierry wrote:

I want to work with multiple regression. So, first step it is to see if
my variables are correlated : I have one dependant variable (Y) and five
independant variables (X1, X2, X3, X4 and X5). X1 and X2 are continuous
variables but X3, X4 and X5 are categorical variables. So, with SPSS I
can transform these categ. var into numerical and after do a test of
corellation to see the values of Pearson coef.
can I do this ?

Yes, you can.

Is it a good idea? I don't think so. Turning categorical variables into
numerical variables doesn't change the fact that they are categorical. It
simply provides a trick so that regression software/algorithms can be used
to handle what is really an Analysis of Covariance (ANCOVA).

I am not sure what purpose it would serve to compute a Pearson correlation
on a categorical variable with a continuous variable. Perhaps you could
explain further what you want to do.

I do see a purpose, for example, in determining if the mean of level A of
X3 is different than the mean of level B of X3. If so, ANCOVA or the
regression equivalent will provide a statistical test (under the usual
assumptions).

--
Paige Miller
pmiller5@xxxxxxxxxxxxxxxx

It's nothing until I call it -- Bill Klem, NL Umpire
If you get the choice to sit it out or dance,
I hope you dance -- Lee Ann Womack


.

Relevant Pages

  • Re: correlation _ Pearson
    ... var is correlated with the others indep. ... Either I don't understand what you mean, or you don't understand what correlation means. ... I hope you dance -- Lee Ann Womack ... >>> I want to work with multiple regression. ...
    (sci.stat.edu)
  • Re: correlation _ Pearson
    ... var. ... Y is correlated with indep. ... don't understand what correlation means. ... I hope you dance -- Lee Ann Womack ...
    (sci.stat.edu)
  • Re: correlation _ Pearson
    ... Turning categorical variables into numerical variables doesn't change the fact that they are categorical. ... I am not sure what purpose it would serve to compute a Pearson correlation on a categorical variable with a continuous variable. ... I hope you dance -- Lee Ann Womack ...
    (sci.stat.edu)