当我将因子转换为数字或整数时,我得到基础级别代码,而不是值作为数字.
f <- factor(sample(runif(5), 20, replace = TRUE))
## [1] 0.0248644019011408 0.0248644019011408 0.179684827337041
## [4] 0.0284090070053935 0.363644931698218 0.363644931698218
## [7] 0.179684827337041 0.249704354675487 0.249704354675487
## [10] 0.0248644019011408 0.249704354675487 0.0284090070053935
## [13] 0.179684827337041 0.0248644019011408 0.179684827337041
## [16] 0.363644931698218 0.249704354675487 0.363644931698218
## [19] 0.179684827337041 0.0284090070053935
## 5 Levels: 0.0248644019011408 0.0284090070053935 ... 0.363644931698218
as.numeric(f)
## [1] 1 1 3 2 5 5 3 4 4 1 4 2 3 1 3 5 4 5 3 2
as.integer(f)
## [1] 1 1 3 2 5 …