我有一个数据帧 structure(list(group = structure(c(2L, 2L, 2L, 3L, 2L, 2L, 2L,
2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 1L,
2L, 2L, 2L, 2L, 2L, 3L, 2L, 2L, 3L, 2L, 2L, 2L, 3L, 2L, 3L, 2L,
1L, 3L, 3L, 2L, 2L, 2L, 3L, 1L, 2L, 1L, 1L, 1L, 3L, 3L, 2L, 2L,
3L, 1L, 3L, 1L, 2L, 1L, 3L, 2L,