SciencesPo (version 1.3.9)

cox.shugart: Cox-Shugart Measure of Proportionality

Description

Calculate the Cox and Shugart measure of proportionalitybased on a vector of votes and a vector for the electoral outcome. This measure is also referred to as the regression index.

Usage

cox.shugart(v, s, ...)
cox.shugart(v, s, ...)

Arguments

v

A numeric vector of data values for votes each political party obtained.

s

A numeric vector of data values for seats each political party obtained, the election outcome as seats.

...

Additional arguements (currently ignored)

Value

• A single score given the votes each party received and seats obtained.

See Also

inv.cox.shugart, farina, politicalDiversity, grofman, gallagher, lijphart. For more details see the Indices vignette: vignette("Indices", package = "SciencesPo").

Examples

if (interactive()) {
# 2012 Queensland state elecion:
pvotes= c(49.65, 26.66, 11.5, 7.53, 3.16, 1.47)
pseats = c(87.64, 7.87, 2.25, 0.00, 2.25, 0.00)

cox.shugart(pvotes, pseats)

# 2012 Quebec provincial election:
pvotes = c(PQ=31.95, Lib=31.20, CAQ=27.05, QS=6.03, Option=1.89, Other=1.88)
pseats = c(PQ=54, Lib=50, CAQ=19, QS=2, Option=0, Other=0)

cox.shugart(pvotes, pseats)
}