usdata (version 0.1.0)

prrace08: Election results for the 2008 U.S. Presidential race

Description

Election results for the 2008 U.S. Presidential race

Usage

prrace08

Format

A data frame with 51 observations on the following 7 variables.

state

State name abbreviation

state_full

Full state name

n_obama

Number of votes for Barack Obama

p_obama

Proportion of votes for Barack Obama

n_mc_cain

Number of votes for John McCain

p_mc_cain

Proportion of votes for John McCain

el_votes

Number of electoral votes for a state

Details

In Nebraska, 4 electoral votes went to McCain and 1 to Obama. Otherwise the electoral votes were a winner-take-all.

Examples

# NOT RUN {
#===> Obtain 2010 US House Election Data <===#
hr <- table(houserace10[,c("abbr", "party1")])
nr <- apply(hr, 1, sum)

#===> Obtain 2008 President Election Data <===#
pr   <- prrace08[prrace08$state != "DC",c("state", "p_obama")]
hr   <- hr[as.character(pr$state),]
(fit <- glm(hr ~ pr$p_obama, family=binomial))

#===> Visualizing Binomial outcomes <===#
x  <- pr$p_obama[pr$state != "DC"]
nr <- apply(hr, 1, sum)
plot(x, hr[,"Democrat"]/nr, pch=19, cex=sqrt(nr), col="#22558844",
    xlim=c(20, 80), ylim=c(0, 1), xlab="Percent vote for Obama in 2008",
    ylab="Probability of Democrat winning House seat")

#===> Logistic Regression <===#
x1 <- pr$p_obama[match(houserace10$abbr, pr$state)]
y1 <- (houserace10$party1 == "Democrat")+0
g  <- glm(y1 ~ x1, family=binomial)
X  <- seq(0, 100, 0.1)
lo <- -5.6079 + 0.1009*X
p  <- exp(lo)/(1+exp(lo))
lines(X, p)
abline(h=0:1, lty=2, col="#888888")

# }