> I want to make a dotplot with ratings from Items in 6 ItemsGroups.
> I reordered the items by rating within each group.
> I plotted the items by rating conditional on ItemGroup.
> The ordering works as I wanted but my y-aches labels (items) within each
> ItemGroup are now unequally spaced, e.g., in some panels there is a
> gap between one lower rated item and the next higher, to give a picture

> items=a,e,f,g

> ItemGroup=n
> -----------------
> g|      .
> f|   .
> e|  .
>  |
>  |
>  |
> a| .
> -----------------

> How can I correct this? What have I overlooked?

> # code i've used (from latticeExtra/utilities/resize panels)
> library(latticeExtra)

> mean.ratings$item.name <-
>    with(mean.ratings, reorder(reorder(item, rating),
>                        as.numeric(ItemGroup)))
> dpratings <-
>    dotplot(item.name ~ rating | reorder(ItemGroup, rating),
>            data = mean.ratings, layout = c(1, 6), xlim=c(1,6),
>            aspect = .1,
>            scales = list(y = list(relation = "free", cex=.5)))

> ## approximate
> resizePanels(dpratings,
>             h = with(mean.ratings, table(reorder(ItemGroup, rating))))

> thanks,
> René

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