add different regression lines for groups on ggplot
I have not tried anything like that but have a look at www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&ved=0CDkQFjAC&url=http%3A%2F%2Fstackoverflow.com%2Fquestions%2F7476022%2Fgeom-point-and-geom-line-for-multiple-datasets-on-same-graph-in-ggplot2&ei=MfHzUej7FoSergG1_ICYAw&usg=AFQjCNH2b72a6un_xAM-PYxC-sUGU8-xOw&sig2=iBIrl1uhIsJXmPbAh4kUbw&bvm=bv.49784469,d.aWM You may be able to use two smooth statements to do what you want. John Kane Kingston ON Canada
-----Original Message----- From: yelin at lbl.gov Sent: Fri, 26 Jul 2013 12:21:23 -0700 To: r-help at r-project.org Subject: [R] add different regression lines for groups on ggplot Hey All, I need to apply different regression lines to different group on my ggplot, and here is the code I use: qplot(x=Var1,y=Var2,data=df,color=SiteID,group=SiteID)+geom_point()+geom_smooth(method='lm',formula=log(y)~I(1/x),se=FALSE,size=2) However the regression for different groups is as below: AL1/AL2: log(y)~I(1/x) AL3: log(y)~log(x) How can I apply each regression equation on the same ggplot? Also I have an issue that if I use the code above, the regression lines are not overlapped on top of my data points. Thanks for your help!
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