```Date: Wed, 30 Nov 2005 11:13:30 -0500 Reply-To: Wensui Liu Sender: "SAS(r) Discussion" From: Wensui Liu Subject: Re: multiregression question Comments: To: lixiaoyao In-Reply-To: <1133335040.960743.190080@g49g2000cwa.googlegroups.com> Content-Type: text/plain; charset=ISO-8859-1 LXY, if you have a regression model y = f(x1, x2). then the simple scatter plots will be y*x1for x1 and y*x2 for x2 and partial plots will be y-f(x1)*x2 for x2 and y-f(x2)*x1 for x1. On 11/30/05, lixiaoyao wrote: > > Hi all > I want to do a multiple regression,I read the link > http://www.ats.ucla.edu/stat/sas/webbooks/reg/chapter2/sasreg2.htm,about > how to test the nonlinearity,they show me a simple regression,and they > said > " > This section has shown how you can use scatterplots to diagnose > problems of non-linearity, both by looking at the scatterplots of the > predictor and outcome variable, as well as by examining the residuals > by predicted values. These examples have focused on simple regression; > however, similar techniques would be useful in multiple regression. > However, when using multiple regression, it would be more useful to > examine partial regression plots instead of the simple scatterplots > between the predictor variables and the outcome variable. > > " > > I do not understand "what is the partial regression plots instead of > the simple scatterplots between the predictor variables and the outcome > variable" > Can anyone explain this more to me or give me a detail link? > Thank you for your time! > -- WenSui Liu (http://statcompute.blogspot.com) Senior Decision Support Analyst Health Policy and Clinical Effectiveness Cincinnati Children Hospital Medical Center ```

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