1. 필요한 패키지 인스톨하기
install.packages("ggplot2")
install.packages("dplyr")
2. 필요한 패키지 불러오기
library(ggplot2)
library(dplyr)
library(MASS)
3. 필요한 Database 불러오기
data("Cars93")
Cars93
데이터의 형태는 위와 같이 생김
4. Frequency Bar Chart (Type을 기준으로)
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