[R-sig-ME] mer-class in lme4 package

Cantieni Andrea PHZ Schwyz andrea.cantieni at phz.ch
Tue Nov 20 15:26:16 CET 2012

Thank you, Ben Bolker, for the explanations. It works...!

Andrea Cantieni

Am 20.11.2012 um 14:41 schrieb Ben Bolker:

> Cantieni Andrea PHZ Schwyz <andrea.cantieni at ...> writes:
>> Hi,
>> I'm trying to access the transpose of model matrix 
>> (Zt) for the random effects of an object returned by lmer().
>> In lme4.0 v0.999999-1 that is easy done via the slots, e.g.
>> fm01 <at> Zt, where fm01 is an object of class "mer".
>> Can someone explain why this slot (and others) disappeared, e.g. in lme4
> v0.99999911-0? And how I can
>> access this properties anyway?
>  To get the transpose of the model matrix in recent versions of
> lme4 (either stable/CRAN or development/R-Forge), please use
> getME(fm01,"Zt") ... we have instituted this accessor method because
> it gives us more freedom to rearrange the internal storage format
> of the models as we see fit, without breaking anyone's code going
> forward.
>  Ben Bolker
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