From:"Rajeev Menon" 
Subject: [NMusers] WRES ve PRED plots
Date:Thu, 27 Mar 2003 11:48:45 -0500

 I am working on a data set. Its a rich data set and I am using an ADVAN 4 TRANS
1 model with METHOD =1 INTERACTION.

The model minimizes and the estimates are good. It also gives me the covariance
matrix. However the WRES vs PRED plots show a cone shaped pattern.

My error syntax is

$ ERROR
IPRED=F
IRES=DV-IPRED
IWRES=IRES/F
Y = F+F*(ERR(1)) + ERR(2)


Taking out the additive error does not have a significant impact. Taking out the
proportional error  does not work.

Could you help me to understand what's happening here.

Thanks,

Rajeev
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From: "Bhattaram, Atul" 
Subject: RE: [NMusers] WRES ve PRED plots
Date:Thu, 27 Mar 2003 12:47:14 -0500

Hello Rajeev

Did you try transforming your data?

Venkatesh Atul Bhattaram
CDER, FDA.
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