elec (version 0.1.2.2)

yolo: Yolo County, CA Election Data

Description

This is for measure W in Yolo County, CA, November 2008. The file includes precinct-level reports.

In the actual audit, 6 precincts were selected (see example) and audited by hand-to-eye count by a group of 4 people cross-checking each other. One of the 6 batches had underreported the "yes" votes by 1, and one had overreported the "yes" votes by 1. There were no other errors.

Format

A data frame with 114 observations on the following 8 variables.

PID

Unique identifier for the batches of ballots

Pct

The precinct id of the batch

how

Vote by mail (VBM) or walk-in (PCT)

b

Number of votes cast in that unit

under

Number of undervotes (ballots not voted).

over

Number of overvotes (where someone marked both yes and no).

y

Reported number of valid ballots marked yes.

n

Reported number of valid ballots marked no.

References

See Stark et al. for papers using this data to illustrate risk-limiting audits of election data.

Examples

# NOT RUN {
# Make an elec.data object out of precicnt-level results
data(yolo)
yolo = elec.data( yolo, C.names=c("y","n","under","over"), tot.votes.col="b" ) 

# Look at different sample sizes and cuts for setting aside
# small precincts
CAST.calc.opt.cut( yolo, beta=0.75, stages=1, t=5, plot=TRUE )

print( yolo )

# Get details of the audit plan -- expected work, etc.
ap <- CAST.calc.sample( yolo, beta=0.75, stages=1, t=5, small.cut=5 )
print( ap )

# Draw a sample (seed not used for actual audit)
CAST.sample(yolo, ap, seed=12345678)



# }