缺失值
处理方法:
- 直接删除
- 使用均值代替
查看:
> Missing.map(a1)
Legend: '_' no, ':' some, '!' all
var missing.map total percent
1 mpg ________________________________ 0 0
2 cyl __!!!!!!!!______________________ 8 25
3 disp ________________________________ 0 0
4 hp ________________________________ 0 0
5 drat ________________________________ 0 0
6 wt ________________________________ 0 0
7 qsec ________________________________ 0 0
8 vs ________________________________ 0 0
9 am ________________________________ 0 0
10 gear ________________________________ 0 0
11 carb ________________________________ 0 0
异常值
使用箱线图检验使用Str 检查。