The format is:
num [1:615, 1:13] 1 1 1 1 1 1 1 1 1 1 ...
- attr(*, "dimnames")=List of 2
..$ : chr [1:615] "1" "2" "3" "4" ...
..$ : chr [1:13] "Category" "Age" "Sex" "ALB" ...
Details
There are 31 missing values in the data set, accounting for 0.39 percent.
References
Lichtinghagen, R., Pietsch, D., Bantel, H., Manns, M., Brand, K. and Bahr, Matthias. (2013). The Enhanced Liver Fibrosis (ELF) Score: Normal Values, Influence Factors and Proposed Cut-Off Values.. Journal of hepatology. 59. 236-242.