R 데이터프레임 구간별 집단 분할

1 개요

R 데이터프레임 구간별 집단 분할

df <- read.csv( header=T, stringsAsFactors=F, text="
student,math,science
Alice,100,50
Bob,90,60
Carol,80,70
David,70,80
Erin,60,90
")
df
##   student math science
## 1   Alice  100      50
## 2     Bob   90      60
## 3   Carol   80      70
## 4   David   70      80
## 5    Erin   60      90

df$math_grade <- cut(df$math, breaks=c(0,75,90,100))
df
##   student math science math_grade
## 1   Alice  100      50   (90,100]
## 2     Bob   90      60    (75,90]
## 3   Carol   80      70    (75,90]
## 4   David   70      80     (0,75]
## 5    Erin   60      90     (0,75]

df$math_grade <- cut(df$math, breaks=c(0,75,90,100), labels=c("C","B","A"))
df
##   student math science math_grade
## 1   Alice  100      50          A
## 2     Bob   90      60          B
## 3   Carol   80      70          B
## 4   David   70      80          C
## 5    Erin   60      90          C

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