将特定列 "words"替换为数字或空白

Question

输入表

Patients  Hospital   Drug   Response
1         AAA        a      Good
1         AAA        a      Bad
2         BBB        a      Bad
3         CCC        b      Good
4         CCC        c      Bad
5         DDD        e      undefined 

输出文件

Patients  Hospital   Drug   Response
1         AAA        a      1
1         AAA        a      -1
2         BBB        a      -1
3         CCC        b      1
4         CCC        c      -1
5         DDD        e       

如何将一列中的3个文本替换为数字和空白？

“响应列良好”改为“1”将“响应列中的错误”更改为“-1”“响应列中未定义”改为“”

数据:

structure(list(Patients = c(1L, 1L, 2L, 3L, 4L, 5L), Hospital = structure(c(1L, 
1L, 2L, 3L, 3L, 4L), .Label = c("AAA", "BBB", "CCC", "DDD"), class = "factor"), 
    Drug = structure(c(1L, 1L, 1L, 2L, 3L, 4L), .Label = c("a", 
    "b", "c", "e"), class = "factor"), Response = structure(c(2L, 
    1L, 1L, 2L, 1L, 3L), .Label = c("Bad", "Good", "undefined"
    ), class = "factor")), .Names = c("Patients", "Hospital", 
"Drug", "Response"), class = "data.frame", row.names = c(NA, 
-6L))

Answer 1

您可以通过更改因子响应的标签，用一行来完成此操作:

> within(df, Response <- factor(Response, labels = c(-1, 1, "")))
  Patients Hospital Drug Response
1        1      AAA    a        1
2        1      AAA    a       -1
3        2      BBB    a       -1
4        3      CCC    b        1
5        4      CCC    c       -1
6        5      DDD    e