BushApproval {UsingR} | R Documentation |
U.S. President George Bush approval ratings
Description
Approval ratings as reported by six different polls.
Usage
data(BushApproval)
Format
A data frame with 323 observations on the following 3 variables.
- date
The date poll was begun (some take a few days)
- approval
a numeric number between 0 and 100
- who
a factor with levels
fox
gallup
newsweek
time.cnn
upenn
zogby
Details
A data set of approval ratings of George Bush over the time of his presidency, as reported by several agencies. Most polls were of size approximately 1,000 so the margin of error is about 3 percentage points.
Source
This data was found at http://www.pollingreport.com/BushJob.htm. The idea came from an article in Salon http://salon.com/opinion/feature/2004/02/09/bush_approval/index.html by James K. Galbraith.
Examples
data(BushApproval)
attach(BushApproval)
## Plot data with confidence intervals. Each poll gets different line type
## no points at first
plot(strptime(date,"%m/%d/%y"),approval,type="n",
ylab = "Approval Rating",xlab="Date",
ylim=c(30,100)
)
## plot line for CI. Margin or error about 3
## matlines has trouble with dates from strptime()
colors = rainbow(6)
for(i in 1:nrow(BushApproval)) {
lines(rep(strptime(date[i],"%m/%d/%y"),2),
c(approval[i]-3,approval[i]+3),
lty=as.numeric(who[i]),
col=colors[as.numeric(who[i])]
)
}
## plot points
points(strptime(date,"%m/%d/%y"),approval,pch=as.numeric(who))
## add legend
legend((2003-1970)*365*24*60*60,90,legend=as.character(levels(who)),lty=1:6,col=1:6)
detach(BushApproval)
[Package UsingR version 2.0-7 Index]