How to show panels for factor levels of conditioning variables
which do have no values?
E.g. there are panels for "Grand Rapids" when they have values:
data( barley )
with( barley, dotplot(variety ~ yield | year * site, layout=c(6,2) ) )
There are no panels for "Grand Rapids"
when there are no values for "Grand Rapids":
my.barley <- subset( barley, ! ( site == "Grand Rapids" ) )
with( my.barley, dotplot(variety ~ yield | year * site, layout=c(6,2) ) )
But there is a level "Grand Rapids":
levels( my.barley$site )
[1] "Grand Rapids" "Duluth"
[3] "University Farm" "Morris"
[5] "Crookston" "Waseca"
Is there an option to show empty panels for "Grand Rapids" in ``my.barley''?
Thanks. Wolfram
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