Created
July 5, 2024 07:58
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Quick proportionality calculation
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library(tidyverse) | |
dat <- tribble(~party, ~seat_share, ~vote_share, | |
"Lab", 411/632, .338, | |
"Con", 119/632, .237, | |
"LDem", 71/632, .122, | |
"SNP", 9/632, .024, | |
"Ind", 6/632, 0.02, | |
"Ref", 4/632, .143, | |
"Green", 4/632, .068, | |
"Plaid", 4/632, .007, | |
"Other", 0/631, .04) | |
d_gall <- function(v, s) { | |
sqrt(1/2 * sum((v - s)^2)) | |
} | |
d_sl <- function(v, s) { | |
good <- which(v > 0) | |
v <- v[good] | |
s <- s[good] | |
sum((s - v)^2 / v) | |
} | |
gallagher <- d_gall(dat$vote_share, dat$seat_share) | |
sainte_lague <- d_sl(dat$vote_share, dat$seat_share) |
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