Hi Folks,
I'd really really appreciate if anyone could give me a quick advise for this
one:

I want to fit a piecewise mixed effect model, but it seems I'm not getting
around it

> CD40<-lme(cd4~rt*(rt<25)+rt*(rt>=25),data=frame1,
+   random= ~rt|id, na.action=na.omit)
*
Errore in MEEM(object, conLin, control$niterEM) :
  Singularity in backsolve at level 0, block 1
*
Would anyone have a clue of the matter ?

Huge thanks.
Federico Bonofiglio
-- 
*Little u can do against ignorance,....it will always disarm u:
is the 2nd principle of thermodinamics made manifest, ...entropy in
expansion.**....But setting order is the real quest 4 truth, ......and the
mission of a (temporally) wise dude.
*

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