Scatter plots, linear regression in ggplot2
Hi, Have you looked at the documentation at http://had.co.nz/ggplot2/ ? You will find the answers to your questions there.
On Wed, Aug 24, 2011 at 7:46 AM, ashz <ashz at walla.co.il> wrote:
Hi, Based on some modification that I did to the R Cookbook Graphs Scatterplots code, link:http://wiki.stdout.org/rcookbook/Graphs/Scatterplots%20(ggplot2) I have some questions and I will appreciate a help: - ? ? ? How do I change the legend title?
See the scales documentation on the website.
- ? ? ? How can I change the for each linear regression its color and linetype?
See the geom_smooth documentation on the website.
- ? ? ? How can I add for both the linear regression lines their equations and Rseq inside or below the plot?
see ?annotate Best, Ista
Code:
set.seed(955)
df <- data.frame(cond = rep(c('A', 'B'), each=10),
? ? ? ? ? ? ? ? xvar = 1:20 + rnorm(20,sd=3),
? ? ? ? ? ? ? ? yvar = 1:20 + rnorm(20,sd=3))
ggplot(df, aes(x=xvar, y=yvar, shape=cond)) +
scale_shape_manual(values=c(1,2)) ?+
? ?geom_smooth(method = "lm", se=FALSE) +
? ? ? ? theme_bw()+
? ? ? ? geom_point(size = 5)+
? ? ? ? opts(title = "Xvar vs. Yvar",
? ? ? ? ?plot.title = theme_text(face="bold", size=16),
? ? ? ? ?axis.text.x ?= theme_text(angle=90),
? ? ? ? ?axis.title.x = theme_text(face="bold", size=12),
? ? ? ? ?axis.title.y = theme_text(face="bold", size=12, angle=90),
? ? ? ? ?panel.grid.major = theme_blank(), # switch off major gridlines
? ? ? ? ?panel.grid.minor = theme_blank()
?)
Thanks a lot in advance
--
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Ista Zahn Graduate student University of Rochester Department of Clinical and Social Psychology http://yourpsyche.org