Message-ID: <48D736ED.20904@justemail.net>
Date: 2008-09-22T06:10:53Z
From: eric
Subject: adding layers in ggplot2 (data and code included)
In-Reply-To: <93d6f2a80809212147o5c2e8d4co316396bad5f6217e@mail.gmail.com>
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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