November 2019
Intermediate to advanced
472 pages
9h 23m
Japanese
Content preview from Rグラフィックスクックブック 第2版 ―ggplot2によるグラフ作成のレシピ集
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レシピ
15.17
グループごとにデータを要約する
409
summarise(Weight = mean(HeadWt))
ggplot(c2a, aes(x = Date, fill = Cult, y = Weight)) +
geom_col(position = "dodge")
存在しない組合せを埋めるには（図15-3右）、
tidyr
パッケージの
complete()
関数を使います。
tidyr
は
tidyverse
の一部でもあります。
c2a
のグルーピングも
ungroup()
で解除する必要があります。そうし
なければ期待するより多くの行を返してしまいます。
library(tidyr)
c2b <- c2a %>%
ungroup() %>%
complete(Cult, Date)
ggplot(c2b, aes(x = Date, fill = Cult, y = Weight)) +
geom_
col(position = "dodge")
図15-3 左：存在しない組合せがある棒グラフ 右：存在しない組合せを埋めた棒グラフ
complete()
では存在しない組合せは
NA
で埋められます。違う値で埋めるには
fill
パラメータが使
えます。詳しい情報は
?complete
を参照してください。
関連項目
標準誤差と信頼区間を掲載したい場合は「レシピ 15.18 標準誤差と信頼区間でデータを要約する」
を参照してください。
stat_summary()
を使い、平均を計算してグラフ上に重ねる例は「レシピ
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