[R] plot residuals per factor

[arun]

Hi,
I forgot to mention:
levels(dat1$d)
#[1] "1" "2" "3" "4" "5"

Suppose, if I use different levels
library(car)
dat1$d1<-recode(dat1$d,"1='A';2='B';3='C';4='D';5='E'")
 levels(dat1$d1) # check the order of the levels
#[1] "A" "B" "C" "D" "E"
mypath<-file.path("/home/arun/Trial1",paste("catalin_",LETTERS[1:5],".jpg",sep=""))  #change the file.path according to your system 

for(i in seq_along(mypath)){
 jpeg(file=mypath[i])
 par(mfrow=c(2,2))
 line<-lm(y~x,data=dat1[as.numeric(dat1$d1)==i,])
  plot(line,which=1:4)# if you want only residual vs. fitted, change which=1
  #abline(0,0)
  dev.off()
  } 

In case you need to change the order of levels
 dat1$d1<-factor(dat1$d1,levels=c("C","D","E","A","B"))
 levels(dat1$d1)
#[1] "C" "D" "E" "A" "B"

mypath<-file.path("/home/arun/Trial1",paste("catalin_",LETTERS[c(3,4,5,1,2)],".jpg",sep=""))
 for(i in seq_along(mypath)){
 jpeg(file=mypath[i])
  par(mfrow=c(2,2))
  line<-lm(y~x,data=dat1[as.numeric(dat1$d1)==i,])
   plot(line,which=1:4)
   #abline(0,0)
   dev.off()
   } 
A.K.







----- Original Message -----
From: catalin roibu <catalinroibu at gmail.com>
To: r-help at r-project.org
Cc: 
Sent: Tuesday, January 8, 2013 4:22 AM
Subject: [R] plot residuals per factor

Dear R-users,
I want to plot residuals vs fitted for multiple groups with ggplot2.
I try this code, but unsuccessful.
library("plyr")
models<-dlply(dat1,"d",function(df)
mod<-lm(y~x,data=df)

  ggplot(models,aes(.fitted,.resid), color=factor(d))+
  geom_hline(yintercept=0,col="white",size=2)+
  geom_point()+
  geom_smooth(se=F)

-- 
---
Catalin-Constantin ROIBU
Forestry engineer, PhD
Forestry Faculty of Suceava
Str. Universitatii no. 13, Suceava, 720229, Romania
office phone     +4 0230 52 29 78, ext. 531
mobile phone   +4 0745 53 18 01
                       +4 0766 71 76 58
FAX:                +4 0230 52 16 64
silvic.usv.ro

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