add a linear regression line to the plot

Such things are very easy with the ggplot2 package

install.packages("ggplot2")
library(ggplot2)
Dataset <- data.frame(A = c(10,20,40,80), B = c(30,40,100,200))
ggplot(data = Dataset, aes(x = A, y = B)) + geom_point() +
geom_smooth(method = "lm")

More info and example on the ggplot2 website: http://had.co.nz/ggplot2/

Best regards,

Thierry

------------------------------------------------------------------------
----
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek
team Biometrie & Kwaliteitszorg
Gaverstraat 4
9500 Geraardsbergen
Belgium

Research Institute for Nature and Forest
team Biometrics & Quality Assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium

tel. + 32 54/436 185
Thierry.Onkelinx at inbo.be
www.inbo.be

To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to
say what the experiment died of.
~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of
data.
~ John Tukey

-----Oorspronkelijk bericht-----
Van: r-help-bounces at r-project.org 
[mailto:r-help-bounces at r-project.org] Namens wangxipei
Verzonden: donderdag 13 januari 2011 9:35
Aan: r-help
Onderwerp: [R] add a linear regression line to the plot

 
Dear R users,
   I am a new R user. My problem is very simple: I want to 
add a linear regression line to the plot(type="p"), codes are 
as below:
 
x<-c(10,20,40,80)
y<-c(30,40,100,200)
plot(x,y,type="p")
lines(lm(x~y),col="red",lwd=1.5)
 
I got only plot without linear line.
Many thanks ahead for your advice!

Xipei Wang
E-mail:wangxipei at gmail.com
	[[alternative HTML version deleted]]

______________________________________________
R-help at r-project.org mailing list
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PLEASE do read the posting guide 
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

|>  
|> Dear R users,
|>    I am a new R user. My problem is very simple: I want to add a linear regression line to the plot(type="p"), codes are as below:
|>  
|> x<-c(10,20,40,80)
|> y<-c(30,40,100,200)
|> plot(x,y,type="p")
|> lines(lm(x~y),col="red",lwd=1.5)
|>  
|> I got only plot without linear line.
|> Many thanks ahead for your advice!

What about if you tried 
lines(lm(y~x),col="red",lwd=1.5)

My guess is that would be more likely to work.

~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.   
   ___    Patrick Connolly   
 {~._.~}                   Great minds discuss ideas    
 _( Y )_  	         Average minds discuss events 
(:_~*~_:)                  Small minds discuss people  
 (_)-(_)  	                      ..... Eleanor Roosevelt
	  
~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.

Hi,

lines(lm(x~y),col="red",lwd=1.5)

should be

abline(lm(y~x),col="red",lwd=1.5)

hth.

Am 13.01.2011 09:35, schrieb wangxipei:

 
Dear R users,
   I am a new R user. My problem is very simple: I want to add a linear regression line to the plot(type="p"), codes are as below:
 
x<-c(10,20,40,80)
y<-c(30,40,100,200)
plot(x,y,type="p")
lines(lm(x~y),col="red",lwd=1.5)
 
I got only plot without linear line.
Many thanks ahead for your advice!

Xipei Wang
E-mail:wangxipei at gmail.com
	[[alternative HTML version deleted]]

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

Eik Vettorazzi

Department of Medical Biometry and Epidemiology
University Medical Center Hamburg-Eppendorf

Martinistr. 52
20246 Hamburg

T ++49/40/7410-58243
F ++49/40/7410-57790

Hi, 

if it should be "lines" so you can do that

xy.lm <- lm(y~x)
lines(x, xy.lm$coeff[1] + x*xy.lm$coeff[2], col="blue", lwd=3)

Regards

ep

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