structure(list(case = 1:48, group = c(1L, 1L, 1L, 1L, 1L, 1L,
1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L, 2L, 2L,
2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 3L, 3L, 3L, 3L, 3L, 3L,
3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L), age = c(70L, 68L, 61L,
68L, 77L, 72L, 64L, 65L, 69L, 67L, 71L, 75L, 73L, 68L, 65L, 69L,
63L, 70L, 78L, 73L, 76L, 78L, 65L, 68L, 75L, 65L, 62L, 69L, 70L,
71L, 60L, 69L, 60L, 66L, 75L, 70L, 62L, 63L, 79L, 79L, 66L, 76L,
64L, 61L, 70L, 67L, 69L, 63L), errors = c(9L, 6L, 7L, 8L, 10L,
11L, 4L, 5L, 5L, 6L, 12L, 8L, 9L, 3L, 7L, 6L, 8L, 6L, 12L, 7L,
13L, 10L, 8L, 8L, 11L, 5L, 9L, 6L, 9L, 6L, 9L, 7L, 5L, 3L, 6L,
6L, 7L, 5L, 9L, 8L, 6L, 6L, 3L, 4L, 7L, 5L, 4L, 5L)), .Names = c("case",
"group", "age", "errors"), class = "data.frame", row.names = c(NA,
-48L))