Dear all,
I wish to generate a lattice boxplot which skips an empty cell in a design. I have trawled r-help, scruitinized xyplot(lattice) help page, and merrily reproduced examples of using skip from a couple of previous r-help queries and the example given in Pinheiro & Bates. But I must be missing something...
Here's an example (running R 1.9.1 on Win2k):
# generate some data
df1 <- data.frame(expand.grid(obsnum=seq(1, 15, 1), faca=c("A1", "A2", "A3"),
facb=c("B1","B2", "B3", "B4"), facc=c("C1","C2")), dv=rpois(15*3*4*2,10))# now get rid of the cell B4 & C1 to simulate a missing treatment combination
df2 <- df1[df1$facb !="B4" | df1$facc !="C1", ]
# plain vanilla lattice plot generates an empty panel corresponding to the empty cell
plot1 <- bwplot( dv ~ faca | facb*facc, data=df2) plot1
# now try to skip the empty panel # turn plot history on so that the separate pages can be recalled
plot2 <- update(plot1, skip=c(rep(F, 3), T, rep(F, 4))) plot2
and the 4th panel position of the bottom row is skipped, BUT the B4&C1 cell is shunted to the top left of row 1 and the last panel of plot1 is now moved to page 2. Messing with layout= doesn't help, neither does substituting NA for the values of the missing cell (instead of cutting it out of the data frame). I also get the same behaviour for stripplot and dotplot too.
Apologies if I've missed a previous solution to this during my searches of the archive.
Regards,
Leon Barmuta School of Zoology & TAFI, University of Tasmania, Australia.
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