Data from a study of survival in patients with malignant melanoma.
Patients had their tumors surgically removed between 1962 and 1977.
This dataset is part of the boot R package, originally from Andersen et al. (1993).
Usage
data(melanoma)Format
A data frame with 205 rows and 7 variables:
- time
Numeric. Survival time in days since the operation.
- status
Numeric. Censoring status: 1 indicates death from melanoma, 2 indicates alive at last follow-up (censored), 3 indicates death from other causes (censored).
- sex
Numeric. Sex of the patient: 1 = Male, 0 = Female.
- age
Numeric. Age of the patient in years at the time of operation.
- year
Numeric. Year of the operation.
- thickness
Numeric. Tumor thickness in millimeters (mm).
- ulcer
Numeric. Ulceration status of the tumor: 0 = Absent, 1 = Present.
Source
Andersen, P.K., Borgan, O., Gill, R.D. and Keiding, N. (1993) Statistical Models Based on Counting Processes. Springer-Verlag.
Data included in the boot R package.
Examples
data(melanoma)
str(melanoma)
#> spc_tbl_ [205 × 7] (S3: spec_tbl_df/tbl_df/tbl/data.frame)
#> $ time : num [1:205] 10 30 35 99 185 204 210 232 232 279 ...
#> $ status : num [1:205] 3 3 2 3 1 1 1 3 1 1 ...
#> $ sex : num [1:205] 1 1 1 0 1 1 1 0 1 0 ...
#> $ age : num [1:205] 76 56 41 71 52 28 77 60 49 68 ...
#> $ year : num [1:205] 1972 1968 1977 1968 1965 ...
#> $ thickness: num [1:205] 6.76 0.65 1.34 2.9 12.08 ...
#> $ ulcer : num [1:205] 1 0 0 0 1 1 1 1 1 1 ...
#> - attr(*, "spec")=List of 3
#> ..$ cols :List of 7
#> .. ..$ time : list()
#> .. .. ..- attr(*, "class")= chr [1:2] "collector_double" "collector"
#> .. ..$ status : list()
#> .. .. ..- attr(*, "class")= chr [1:2] "collector_double" "collector"
#> .. ..$ sex : list()
#> .. .. ..- attr(*, "class")= chr [1:2] "collector_double" "collector"
#> .. ..$ age : list()
#> .. .. ..- attr(*, "class")= chr [1:2] "collector_double" "collector"
#> .. ..$ year : list()
#> .. .. ..- attr(*, "class")= chr [1:2] "collector_double" "collector"
#> .. ..$ thickness: list()
#> .. .. ..- attr(*, "class")= chr [1:2] "collector_double" "collector"
#> .. ..$ ulcer : list()
#> .. .. ..- attr(*, "class")= chr [1:2] "collector_double" "collector"
#> ..$ default: list()
#> .. ..- attr(*, "class")= chr [1:2] "collector_guess" "collector"
#> ..$ skip : num 1
#> ..- attr(*, "class")= chr "col_spec"
head(melanoma)
#> # A tibble: 6 × 7
#> time status sex age year thickness ulcer
#> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl> <dbl>
#> 1 10 3 1 76 1972 6.76 1
#> 2 30 3 1 56 1968 0.65 0
#> 3 35 2 1 41 1977 1.34 0
#> 4 99 3 0 71 1968 2.9 0
#> 5 185 1 1 52 1965 12.1 1
#> 6 204 1 1 28 1971 4.84 1
summary(melanoma$time)
#> Min. 1st Qu. Median Mean 3rd Qu. Max.
#> 10 1525 2005 2153 3042 5565
table(melanoma$status, melanoma$ulcer)
#>
#> 0 1
#> 1 16 41
#> 2 92 42
#> 3 7 7