Đọc dữ liệu

library(readxl)
arr <- read_excel("D:/OneDrive/Statistical courses/Can Tho University of Medicine_Sep2022/Data for practice/Insurance dataset.xlsx")
## Registered S3 methods overwritten by 'tibble':
##   method     from  
##   format.tbl pillar
##   print.tbl  pillar

Xem có bao nhiêu biến số bằng hàm names

names (arr)
## [1] "age"      "sex"      "bmi"      "children" "smoker"   "region"   "charge"