I have encountered a problem with faceted bar plots. I have tried to
create something like the example explained in the ggplot2 book (see pp.
126-128):
library(ggplot2)
mpg4 <- subset(mpg, manufacturer %in%
c("audi", "volkswagen", "jeep"))
mpg4$manufacturer <- as.character(mpg4$manufacturer)
mpg4$model <- as.character(mpg4$model)
base <- ggplot(mpg4, aes(fill = model)) +
geom_bar(position = "dodge") +
opts(legend.position = "none")
base + aes(x = model) +
facet_grid(. ~ manufacturer)
That example works fine; the bar heights are just the same as the
counts in the table:
table(mpg4[,1:2])
model
manufacturer a4 a4 quattro a6 quattro grand cherokee 4wd gti jetta new
beetle
audi 7 8 3 0 0 0
0
jeep 0 0 0 8 0 0
0
volkswagen 0 0 0 0 5 9
6
model
manufacturer passat
audi 0
jeep 0
But in other cases this does not occur. For instance, take a small
subset of data(diamonds):
diamonds25 <- droplevels(diamonds[1:25,2:3])
table(diamonds25)
color
cut E F H I J
Fair 1 0 0 0 0
Good 1 0 0 1 4
Very Good 1 0 3 1 4
Premium 3 1 0 1 0
Ideal 1 0 0 1 2
And change the variables mapped in the previous plot:
base <- ggplot(diamonds25, aes(fill = cut)) +
geom_bar(position = "dodge") +
opts(legend.position = "none")
base + aes(x = cut) +
facet_grid(. ~ color)
I see all bars with height = 1.
I have ovserved this problem (wrong bar heights, but not always = 1),
in other cases when all counts are very small or zero.
What's wrong here?
Regards,
Helios
sessionInfo()
R version 2.14.2 (2012-02-29)
Platform: i386-pc-mingw32/i386 (32-bit)
locale:
[1] LC_COLLATE=Spanish_Spain.1252 LC_CTYPE=Spanish_Spain.1252
[3] LC_MONETARY=Spanish_Spain.1252 LC_NUMERIC=C
[5] LC_TIME=Spanish_Spain.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] ggplot2_0.9.0
loaded via a namespace (and not attached):
[1] colorspace_1.1-1 dichromat_1.2-4 digest_0.5.1
grid_2.14.2
[5] MASS_7.3-17 memoise_0.1 munsell_0.3
plyr_1.7.1
[9] proto_0.3-9.2 RColorBrewer_1.0-5 reshape2_1.2.1
scales_0.2.0
[13] stringr_0.6
INSTITUTO DE BIOMEC?NICA DE VALENCIA
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Camino de Vera s/n ? 46022 VALENCIA (ESPA?A)
Tel. +34 96 387 91 60 ? Fax +34 96 387 91 69
www.ibv.org
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rog?ndole lo notifique al remitente.
R. Michael Weylandt
2012-Mar-12 19:59 UTC
[R] Faceted bar plot shows wrong counts (ggplot2)
You get the "good" behavior with base + aes(x = cut) + facet_wrap(~ color, ncol = 5) so this seems buggy to me. If someone here doesn't step forward with more insight, I'd forward it to the ggplot list to see if one of the developers there can give an explanation or possibly make the official call that it's a bug. There was another report of a possible bug in facet_grid() today that could be related: https://groups.google.com/group/ggplot2/browse_thread/thread/5213ac35da6b36d4 Michael On Mon, Mar 12, 2012 at 7:16 AM, Helios de Rosario <helios.derosario at ibv.upv.es> wrote:> I have encountered a problem with faceted bar plots. I have tried to > create something like the example explained in the ggplot2 book (see pp. > 126-128): > > library(ggplot2) > mpg4 ?<- ?subset(mpg, ?manufacturer ?%in% > c("audi", ?"volkswagen", ?"jeep")) > mpg4$manufacturer ?<- ?as.character(mpg4$manufacturer) > mpg4$model ?<- ?as.character(mpg4$model) > > base ?<- ?ggplot(mpg4, ?aes(fill ?= ?model)) ?+ > geom_bar(position ?= ?"dodge") ?+ > opts(legend.position ?= ?"none") > base ?+ ?aes(x ?= ?model) ?+ > facet_grid(. ?~ ?manufacturer) > > That example works fine; the bar heights are just the same as the > counts in the table: > > table(mpg4[,1:2]) > ? ? ? ? ?model > manufacturer a4 a4 quattro a6 quattro grand cherokee 4wd gti jetta new > beetle > ?audi ? ? ? ?7 ? ? ? ? ?8 ? ? ? ? ?3 ? ? ? ? ? ? ? ? ?0 ? 0 ? ? 0 > ? ?0 > ?jeep ? ? ? ?0 ? ? ? ? ?0 ? ? ? ? ?0 ? ? ? ? ? ? ? ? ?8 ? 0 ? ? 0 > ? ?0 > ?volkswagen ?0 ? ? ? ? ?0 ? ? ? ? ?0 ? ? ? ? ? ? ? ? ?0 ? 5 ? ? 9 > ? ?6 > ? ? ? ? ?model > manufacturer passat > ?audi ? ? ? ? ? ?0 > ?jeep ? ? ? ? ? ?0 > > But in other cases this does not occur. For instance, take a small > subset of data(diamonds): > > diamonds25 <- droplevels(diamonds[1:25,2:3]) > table(diamonds25) > ? ? ? ? ? color > cut ? ? ? ? E F H I J > ?Fair ? ? ?1 0 0 0 0 > ?Good ? ? ?1 0 0 1 4 > ?Very Good 1 0 3 1 4 > ?Premium ? 3 1 0 1 0 > ?Ideal ? ? 1 0 0 1 2 > > And change the variables mapped in the previous plot: > > base ?<- ?ggplot(diamonds25, ?aes(fill ?= ?cut)) ?+ > geom_bar(position ?= ?"dodge") ?+ > opts(legend.position ?= ?"none") > base ?+ ?aes(x ?= ?cut) ?+ > facet_grid(. ?~ ?color) > > I see all bars with height = 1. > I have ovserved this problem (wrong bar heights, but not always = 1), > in other cases when all counts are very small or zero. > What's wrong here? > > Regards, > Helios > > sessionInfo() > R version 2.14.2 (2012-02-29) > Platform: i386-pc-mingw32/i386 (32-bit) > > locale: > [1] LC_COLLATE=Spanish_Spain.1252 ?LC_CTYPE=Spanish_Spain.1252 > [3] LC_MONETARY=Spanish_Spain.1252 LC_NUMERIC=C > [5] LC_TIME=Spanish_Spain.1252 > > attached base packages: > [1] stats ? ? graphics ?grDevices utils ? ? datasets ?methods ? base > > other attached packages: > [1] ggplot2_0.9.0 > > loaded via a namespace (and not attached): > ?[1] colorspace_1.1-1 ? dichromat_1.2-4 ? ?digest_0.5.1 > grid_2.14.2 > ?[5] MASS_7.3-17 ? ? ? ?memoise_0.1 ? ? ? ?munsell_0.3 > plyr_1.7.1 > ?[9] proto_0.3-9.2 ? ? ?RColorBrewer_1.0-5 reshape2_1.2.1 > scales_0.2.0 > [13] stringr_0.6 > > > > INSTITUTO DE BIOMEC?NICA DE VALENCIA > Universidad Polit?cnica de Valencia ? Edificio 9C > Camino de Vera s/n ? 46022 VALENCIA (ESPA?A) > Tel. +34 96 387 91 60 ? Fax +34 96 387 91 69 > www.ibv.org > > ?Antes de imprimir este e-mail piense bien si es necesario hacerlo. > En cumplimiento de la Ley Org?nica 15/1999 reguladora de la Protecci?n > de Datos de Car?cter Personal, le informamos de que el presente mensaje > contiene informaci?n confidencial, siendo para uso exclusivo del > destinatario arriba indicado. En caso de no ser usted el destinatario > del mismo le informamos que su recepci?n no le autoriza a su divulgaci?n > o reproducci?n por cualquier medio, debiendo destruirlo de inmediato, > rog?ndole lo notifique al remitente. > > ______________________________________________ > R-help at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code.