Displaying 2 results from an estimated 2 matches for "xm2_dum".
2006 Jan 02
2
mixed effects models - negative binomial family?
Hello all,
I would like to fit a mixed effects model, but my response is of the
negative binomial (or overdispersed poisson) family. The only (?)
package that looks like it can do this is glmm.ADMB (but it cannot
run on Mac OS X - please correct me if I am wrong!) [1]
I think that glmmML {glmmML}, lmer {Matrix}, and glmmPQL {MASS} do
not provide this "family" (i.e. nbinom, or
2005 Oct 19
1
nlme Singularity in backsolve at level 0, block 1
Hi,
I am hoping some one can help with this.
I am using nlme to fit a random coefficients model. It ran for hours before returning
Error: Singularity in backsolve at level 0, block 1
The model is
> plavix.nlme<-nlme(PLX_NRX~loglike(PLX_NRX,PD4_42D,GAT_34D,VIS_42D,MSL_42D,SPE_ROL,XM2_DUM,THX_DUM,b0,b1,b2,b3,b4,b5,b6,b7,alpha),
+ data=data,
+ fixed=list(b0 + b1+b2+b3+b4+b5+b6+b7+alpha~1),
+ random=b0+b1+b2+b3+b4+b5+b6+b7~1|menum,
+
+ start=c(b0=0,b1=0,b2=0,b3=0,b4=0,b5=0,b6=0,b7=0,alpha=5)
+ )
Can anyone tell me what this error means and how I can run the model?
Thanks,
Elizab...