[R] intercept value in lme

Doran, Harold HDoran at air.org
Wed Dec 6 13:57:24 CET 2006


As Andrew noted, you need to provide more information. But, what I see
is that your model assumes X is continuous but you say it is bounded,
-25 < X < 0 

> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of victor
> Sent: Wednesday, December 06, 2006 3:34 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] intercept value in lme
> 
> Dear all,
> 
> I've got a problem in fitting multilevel model in lme. I 
> don't know to much about that but suspect that something is 
> wrong with my model.
> 
> I'm trying to fit:
> 
> m1<-lme(X~Y,~1|group,data=data,na.action=na.exclude,method="ML")
> m2<-lme(X~Y+Z,~1|group,data=data,na.action=na.exclude,method="ML")
> 
> where:
> X - dependent var. measured on a scale ranging from -25 to 0 
> Y - level 1 variable Z - level 1 variable
> 
> In m1 the intercept value is equal -3, in m2 (that is after 
> adding Lev 2
> var.) is equal +16.
> 
> What can be wrong with my variables? Is this possible that 
> intercept value exceeds scale?
> 
> Best regards,
> 
> victor
> 
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