回答編集履歴
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テストスクリプト
test
CHANGED
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@@ -1 +1,79 @@
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case_whenの外にfactor()を置けばいいのでは？
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# コメントを受けて
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難しく考えることはないと思います。
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```
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library(dplyr)
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df <- data.frame(a=seq(-20,20,6))
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df %>% mutate(newvariable = case_when(
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a <= -15 ~ "X",
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a > -15 & a < 15 ~ "Y",
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a >=15 ~ "C"
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)) -> df
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df %>% mutate(newvariable2 = factor(case_when(
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a <= -15 ~ "X",
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a > -15 & a < 15 ~ "Y",
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a >=15 ~ "C"
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))) -> df
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```
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実行結果
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```
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> df
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a newvariable newvariable2
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1 -20 X X
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2 -14 Y Y
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3 -8 Y Y
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4 -2 Y Y
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5 4 Y Y
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6 10 Y Y
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7 16 C C
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> str(df)
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'data.frame': 7 obs. of 3 variables:
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$ a : num -20 -14 -8 -2 4 10 16
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$ newvariable : chr "X" "Y" "Y" "Y" ...
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$ newvariable2: Factor w/ 3 levels "C","X","Y": 2 3 3 3 3 3 1
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>
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```
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