All,
I'm trying to create an augPred plot in the nlme library, similar to the
plot on
p.43 of Pinheiro & Bates (Mixed Effects Models in S and S-Plus) for
their Pixel data.
My data structure is the same as the example but I still get the error
msg below.
> comp.adj.UKV <- groupedData(adj.UKV ~ Time | Patient_no/Lisinopril,
data = comp.adj.UKV.frm, order.groups = F)
> fm1comp = lme(adj.UKV ~ Time + Time.sq, data = comp.adj.UKV, random =
list(Patient_no = ~ 1) )
> plot(augPred(fm1comp, level= 1))
Error in model.frame(formula, rownames, variables, varnames, extras,
extranames, :
variable lengths differ
I've checked all the variale lengths, and have also made sure that
factors are correctly defined
as factors. Is there anything special I need to be doing for augPred
to work correctly? I checked
the help but didn't find much.
cheers,
dave
David Afshartous, PhD
University of Miami
School of Business
Rm KE-408
Coral Gables, FL 33124
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