[R] adding layers in ggplot2 (data and code included)

[Eric]

The way you've attempted to get this result seems to align with the way 
R "should" work, but it fails in this case.
The fix is to break things up a little bit:

p <- ggplot(mydata, aes(x=Est, y=Tri))
p <- p + geom_point(aes(colour=factor(Group),shape=factor(Group)))
p <- p + 
geom_smooth(aes(group=factor(Group),color=factor(Group)),method=lm,se=F)
p


Eric



Juliet Hannah wrote:
> Here is some sample data:
>
> mydata <- read.table(textConnection("Est Group    Tri
>        0        0 4.639644
>        1        0 4.579189
>        2        0 4.590714
>        0        1 4.443696
>        1        1 4.588243
>        2        1 4.650505
>        0        2 4.296608
>        1        2 4.826036
>        2        2 4.765386"),header=TRUE);
>   closeAllConnections();
>
> I can form two plots, scatter and  lines, as follows:
>
> p <- ggplot(mydata, aes(x=Est, y=Tri))
> p + geom_point(aes(colour=factor(Group),shape=factor(Group)))
>
> and
>
> p+ geom_smooth(aes(group=factor(Group),color=factor(Group)),method=lm,se=F).
>
> However, I am unable to have the plots together.
>
> I obtain the following error:
>
>   
>> p + geom_point(aes(colour=factor(Group),shape=factor(Group)))+geom_smooth(aes(group=factor(Group),color=factor(Group)),method=lm,se=F)
>>     
> Error in `[.data.frame`(df, , var) : undefined columns selected
>
> Thanks,
>
> Juliet
>
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