R help - Aug 2011 - Scatter plots, linear regression in ggplot2

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?
-	How can I change the for each linear regression its color and linetype?
-	How can I add for both the linear regression lines their equations and
Rseq inside or below the plot?

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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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
>
>
> --
> View this message in context:
http://r.789695.n4.nabble.com/Scatter-plots-linear-regression-in-ggplot2-tp3765080p3765080.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
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> PLEASE do read the posting guide
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> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Ista Zahn
Graduate student
University of Rochester
Department of Clinical and Social Psychology
http://yourpsyche.org