R help - Apr 2006 - A question about nlme

Hello,
I have used nlme to fit a model, the R syntax is like

fmla0<-as.formula(paste("~",paste(colnames(ldata[,9:13]),collapse="+"),"-1"))
>
fmla1<-as.formula(paste("~",paste(colnames(ldata[,14:18]),collapse="+"),"-1"))
>
fmla2<-as.formula(paste("~",paste(colnames(ldata[,19:23]),collapse="+"),"-1"))
> Block=pdBlocked(list(pdIdent(fmla0),pdIdent(fmla1),pdIdent(fmla2)))
> lme(fixed=Score ~ factor(time)-1,data=ldata,random=list(Block),
+     weights=varIdent(form= ~ 1|time),
+     correlation=corSymm(form= ~ 1|Block/ID))

and the Error message is
Error in parse(file, n, text, prompt) : syntax error in "~ "

I repeatedly check the "~", however, I cannot find anything wrong with
it. Is there anybody can tell what is wrong? Thank you so much!

Zhongmiao Wang

"zhongmiao wang" <zhongmiao at gmail.com> writes:
> Hello,
> I have used nlme to fit a model, the R syntax is like
> 
>
fmla0<-as.formula(paste("~",paste(colnames(ldata[,9:13]),collapse="+"),"-1"))
> >
fmla1<-as.formula(paste("~",paste(colnames(ldata[,14:18]),collapse="+"),"-1"))
> >
fmla2<-as.formula(paste("~",paste(colnames(ldata[,19:23]),collapse="+"),"-1"))
> > Block=pdBlocked(list(pdIdent(fmla0),pdIdent(fmla1),pdIdent(fmla2)))
> > lme(fixed=Score ~ factor(time)-1,data=ldata,random=list(Block),
> +     weights=varIdent(form= ~ 1|time),
> +     correlation=corSymm(form= ~ 1|Block/ID))
> 
> and the Error message is
> Error in parse(file, n, text, prompt) : syntax error in "~ "
> 
> I repeatedly check the "~", however, I cannot find anything wrong
with
> it. Is there anybody can tell what is wrong? Thank you so much!
Is the character following "~" _really_ a space in all three cases?
Shift-space sometimes catches people off guard.

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