私は R 初心者であり、コロプレスとマッピングの初心者でもあります。
このスレッドとそのスレッドがリンクしている他のスレッドを見てきましたが、この問題を回避することはできません。米国の国勢調査データをコロプレス マップにマップしようとしていますが、さまざまな組み合わせを試しても問題がどこにあるのかさえわかりません。
簡単なコードは次のとおりです。必要に応じて、より詳細なコードを提供できます。
code <- c(1:2, 4:6, 8:13, 15:42, 44:51, 53:56, 72)
statename <- c("Alabama", "Alaska", "Arizona", "Arkansas", "California", "Colorado", "Connecticut", "Delaware", "District of Columbia", "Florida", "Georgia", "Hawaii", "Idaho", "Illinois", "Indiana", "Iowa", "Kansas", "Kentucky", "Louisiana", "Maine", "Maryland", "Massachusetts", "Michigan", "Minnesota", "Mississippi", "Missouri", "Montana", "Nebraska", "Nevada", "New Hampshire", "New Jersey", "New Mexico", "New York", "North Carolina", "North Dakota", "Ohio", "Oklahoma", "Oregon", "Pennsylvania", "Rhode Island", "South Carolina", "South Dakota", "Tennessee", "Texas", "Utah", "Vermont", "Virginia", "Washington", "West Virginia", "Wisconsin", "Wyoming", "Puerto Rico")
statelist <- data.frame(code, statename)
populDataNew <- merge(x = populData, y = statelist, by.x = "State", by.y = "code")
incomestate <- ddply(populData, c("Income", "statename"), summarise, incomebystate = sum(Income))
edu <- select(populDataNew, c(statename, EduAttainment), na.rm=TRUE)
edusum <- ddply(edu, c("statename"), summarise, edubystate = mean(EduAttainment))
states_map <-map_data("state")
states_map <- fortify(states_map, region = "statename")
m <- ggplot(edusum, aes(map_id = statename)) + geom_map(aes(fill = edubystate), map = states_map) + expand_limits(x = states_map$long, y = states_map$lat)
m
注：理由がわかりませんが、fortifyを使用しています:(
私が得ているエラーは次のとおりです。
Error in unit(x, default.units) : 'x' and 'units' must have length > 0