R help - Feb 2004 - lattice: showing panels for factor levels with no values

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

On Thursday 12 February 2004 03:12, Wolfram Fischer - Z/I/M
wrote:
> 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''?
No, unused factor levels are dropped. I'll see if adding an option for this
is
feasible.

Deepayan

Wolfram Fischer wrote (
> Is there an option to show empty panels for "Grand Rapids" in
> ``my.barley''?
Deepayan
No, unused factor levels are dropped. I'll see if adding an option for this
is feasible.

Dieter Menne:

See also

http://maths.newcastle.edu.au/~rking/R/help/01c/2820.html

Deepayan, at that time I received an e-mail (not in the archives) from you
saying that this feature was already in the code, but not yet active (quoted
from memory).


Dieter Menne