[From nobody Sat Mar 18 16:24:09 2006

Hi all,

I've got some troubles with a Lattice plot. The error I get is 

Error in Ops.factor(groups[subscripts], vals[i]) : 
	Level sets of factors are different

which sort of doesn't make sense to me. Can you please help me figure
out what it means?

Here is the code:

my.panelconstr = function(x,y,...){
  panel.barchart(x,y,horizontal=F)
	panel.superpose(x,y,...)
}

attach(m1data)
		! is.na(asp.durms) & !is.na(agem) & !is.na(Cplace) &
		!is.na(tokentype)& !is.na(voicing)-> sel
detach(m1data)

barchart(asp.durms[sel] ~ agem[sel] | Cplace[sel] +
		tokentype[sel],data=m1data,xlab="Subject Age
		(months)",ylab="Duration of Aspiration
		(ms)",panel=my.panelconstr,groups=voicing[sel],key=list(points=Rows(trellis.par.get()$superpose.symbol,
		1:2),text=list(c("Percieved voiced    ","Percieved
		voiceless")),adj=c(0,0),space="right"),horizontal=F)

Here is some information about the factors involved:

> levels(m1data$agem)
> NULL
> levels(m1data$durms)
> NULL
> levels(m1data$Cplace)
> [1] "bilabial" "dental"   "velar"   
> levels(m1data$tokentype)
> [1] "CC"          "voiced C"    "voiceless C"
> levels(m1data$voicing)
> [1] "voiced"    "voiceless"
> attach(m1data)
> ! is.na(asp.durms) & !is.na(agem) & !is.na(Cplace) & !is.na(tokentype)& !is.na(voicing)-> sel
> detach(m1data) 
> levels(m1data$voicing[sel])
> [1] "voiced"    "voiceless"


If  I remove everything involving the groups (groups= as well as the
panel.superpose..) it works, but I need groups too..

Happy for all the help I can get!

/Fredrik


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]