On Jun 21, 2011, at 1:03 PM, wwreith wrote:
I took some data from an online poll about which R GUI people used
most and I
am messing around with it to learn how to use qplot. Specifically I am
making a horizontal bar graph and I have two questions.
1. The categories are ordered in rather strange way at least to me.
It is
not alphabetical or ascending/descending order of votes cast so i
had to
manually state the order I wanted which is fine, but is there an
easy way
put the cateogies in alphabetical order or in my case descending
order?
Maybe something like: order="alphabetical"
var <- factor(var) will by default give a factor variable which most
plotting functions will display in alpha order.
2. Is there an easy way to take a bar graph of count data and turn
it into a
bar graph of percentages. I know I can count how many items are in
each
category then divide by the total and then graph that, but is there
something quick like geom="percent" or something that would do it
automatically?
?hist # see the 'freq' argument
or
require(lattice)
?histogram # use ... , type="percent")
--
david
Code:
library(ggplot2)
x<-R.GUI.Poll$Poll
q<-qplot(x, main="Most Popular R-GUIs", ylab="Votes Received",
xlab="R GUI",
fill=I("blue"), colour=I("black"))+coord_flip()+scale_x_discrete(
limits=c("R via a data mining tool plugin","Rexcel","JGR (Java Gui for
R)","RKWard","Revolution Analytics","R Commander","Rattle GUI","ESS
(Emacs
Speaks Statistics)","Tinn-R","RapidMiner R extension","Eclipse with
StatET","Rstudio","Built-in R console"))
q<-q+opts(axis.text.x = theme_text(colour = "black", size = 12))
q<-q+opts(plot.title = theme_text(colour = "black", face="bold",
size = 16,
vjust=2))
q<-q+opts(axis.text.y = theme_text(colour = "black", hjust=1))
q<-q+opts(axis.title.y = theme_text(face= "bold", size= 12, angle=90))
q<-q+opts(axis.title.x = theme_text(face= "bold", size= 12, vjust=-.
5))
q
--
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David Winsemius, MD
West Hartford, CT
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