构建数据集
> data1 <- data.frame(
+ id = c(1, 2, 3, 4, 5),
+ city = I(c("GZ", "ZZ", 'BJ', "Newyork",...Count
1 1 GZ CN 100
2 2 ZZ CN 30
3 3 BJ CN 20
4 4 Newyork...50
>
>
>
>
> data2 <- data.frame(
+ id = c(1, 2, 3, 4, 5),
+ city = I(c("GZ", "ZZ", 'SH', "Newyork...Area
1 1 GZ CN 3
2 2 ZZ CN 5
3 3 SH CN 7
4 4 Newyork...CN 100 3
2 2 ZZ CN 30 5
3 3 BJ CN 20 NA
4 4 Newyork