Đọc dữ liệu vào Birthwt
bw=read.csv("D:\\R\\DỮ LIỆU THỰC HÀNH (TS Thạch gửi)\\birthwt.csv")###Kiem tra hang cot
dim(bw)## [1] 189 11###kiem tra
tail(bw,10)## id low age lwt race smoke ptl ht ui ftv bwt
## 180 71 1 17 120 2 0 0 0 0 2 2438
## 181 75 1 26 154 3 0 1 1 0 1 2442
## 182 76 1 20 105 3 0 0 0 0 3 2450
## 183 77 1 26 190 1 1 0 0 0 0 2466
## 184 78 1 14 101 3 1 1 0 0 0 2466
## 185 79 1 28 95 1 1 0 0 0 2 2466
## 186 81 1 14 100 3 0 0 0 0 2 2495
## 187 82 1 23 94 3 1 0 0 0 0 2495
## 188 83 1 17 142 2 0 0 1 0 0 2495
## 189 84 1 21 130 1 1 0 1 0 3 2495###kiem tra 15 hang dau
head(bw,15)## id low age lwt race smoke ptl ht ui ftv bwt
## 1 85 0 19 182 2 0 0 0 1 0 2523
## 2 86 0 33 155 3 0 0 0 0 3 2551
## 3 87 0 20 105 1 1 0 0 0 1 2557
## 4 88 0 21 108 1 1 0 0 1 2 2594
## 5 89 0 18 107 1 1 0 0 1 0 2600
## 6 91 0 21 124 3 0 0 0 0 0 2622
## 7 92 0 22 118 1 0 0 0 0 1 2637
## 8 93 0 17 103 3 0 0 0 0 1 2637
## 9 94 0 29 123 1 1 0 0 0 1 2663
## 10 95 0 26 113 1 1 0 0 0 0 2665
## 11 96 0 19 95 3 0 0 0 0 0 2722
## 12 97 0 19 150 3 0 0 0 0 1 2733
## 13 98 0 22 95 3 0 0 1 0 0 2751
## 14 99 0 30 107 3 0 1 0 1 2 2750
## 15 100 0 18 100 1 1 0 0 0 0 2769