[R] Randoms interactions in lme

[Berton Gunter]

Julien:

Big difference! You need to spend time with Bates and Pinheiro to understand
the concepts, but in brief:

~1|x/y  means that x and y are grouping variables with y nested within x and
a different random offset for each x and y within x.

~y|x means that x is a grouping variable and y is a linear covariate with a
different random (intercept and) slope for each x group.


-- Bert Gunter
Genentech Non-Clinical Statistics
South San Francisco, CA
 
"The business of the statistician is to catalyze the scientific learning
process."  - George E. P. Box
 

-- Bert Gunter
Genentech Non-Clinical Statistics
South San Francisco, CA
 
"The business of the statistician is to catalyze the scientific learning
process."  - George E. P. Box
 
 

> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Martin Julien
> Sent: Tuesday, January 18, 2005 12:42 PM
> To: r-help at stat.math.ethz.ch
> Subject: [R] Randoms interactions in lme
> 
> In lme, what's the difference between "random = ~ 1 | x / y" 
> and "random = ~
> y | x"     ?
> 
>  
> 
> Thanks
> 
> Julien
> 
> 
> 	[[alternative HTML version deleted]]
> 
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