ulcer: Ulcer data from table 9.7
In dobson: Data from the GLM Book by Dobson and Barnett

Description Usage Format References Examples

Data from a retrospective case-control study. A group of ulcer patients was compared with a group of control patients not known to have peptic ulcer, but who were similar to the ulcer patients with respect to age, sex and socioeconomic status.

1	data(ulcer)

A tibble with 8 observations and the following 4 variables.

ulcer: type of ulcer
case-control: case or control
aspirin: aspirin user
frequency: frequency

Duggan, J. M., A. J. Dobson, H. Johnson, and P. P. Fahey (1986). Peptic ulcer and non-steroidal anti-inflammatory agents. Gut 27, 929<e2><80><93>933.