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From |
Richard Williams <Richard.A.Williams.5@ND.edu> |

To |
"statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>, "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |

Subject |
Re: st: centering explanatory variables around zero |

Date |
Sun, 09 Aug 2009 14:31:26 -0500 |

At 12:50 PM 8/9/2009, Nikolaos Pandis wrote:

I have the following model y=a + b1x1 + b2x2 y and x2 are continuous x1=categorical with 3 levels

I find a large difference in the p-values for the explanatoryvariables between the interaction and no-interaction model.I centered for the continuous variable x2 ((sum x2, gen cx2=x2-r(mean)). I get similar p values for interaction and no-interaction models.Question: How about the categorical explanatory variable? Is itappropriate to center this variable also? Does it make any sense?

http://www.nd.edu/~rwilliam/stats2/l53.pdf ------------------------------------------- Richard Williams, Notre Dame Dept of Sociology OFFICE: (574)631-6668, (574)631-6463 HOME: (574)289-5227 EMAIL: Richard.A.Williams.5@ND.Edu WWW: http://www.nd.edu/~rwilliam * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**FW: st: centering explanatory variables around zero***From:*Cameron McIntosh <cnm100@hotmail.com>

**Re: st: centering explanatory variables around zero***From:*Nikolaos Pandis <npandis@yahoo.com>

**References**:**st: centering explanatory variables around zero***From:*Nikolaos Pandis <npandis@yahoo.com>

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