[R] Scatter plots, linear regression in ggplot2

[Ista Zahn]

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