example13_2<-read.csv("example13_2.csv")
attach(example13_2)
mytable<-xtabs(~a+b)
然后报错:Error in model.frame.default(formula = ~a + b) : 变数的长度不一样('b')
请问为什么会报错,该怎么解决呢?
附example13_2:
| a | b |
1 | 1 |
1 | 1 |
1 | 1 |
1 | 1 |
1 | 1 |
1 | 1 |
1 | 1 |
1 | 1 |
1 | 1 |
1 | 1 |
1 | 1 |
1 | 1 |
1 | 1 |
1 | 1 |
1 | 1 |
1 | 1 |
1 | 1 |
1 | 1 |
1 | 1 |
1 | 1 |
1 | 1 |
1 | 1 |
1 | 1 |
1 | 1 |
1 | 1 |
1 | 1 |
1 | 1 |
1 | 1 |
1 | 1 |
1 | 1 |
1 | 2 |
1 | 2 |
1 | 2 |
1 | 2 |
1 | 2 |
1 | 2 |
1 | 2 |
1 | 2 |
1 | 2 |
1 | 2 |
2 | 1 |
2 | 1 |
2 | 1 |
2 | 1 |
2 | 1 |
2 | 1 |
2 | 1 |
2 | 1 |
2 | 1 |
2 | 1 |
2 | 1 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |
2 | 2 |