Two groups of male mice were given 300 rads of radiation and and tracked until death for instances of cancer. One group was maintained in a germ-free environment; a control group was maintained a standard lab environment. The cause of death is recorded for all mice. In particular, it is worth noting that not all mice died of cancer.
Group: Experimental group (Control, Germ-free)Cause: Cause of death (Thymic lymphoma, Reticulum cell sarcoma, Other)Time: Time of death (days)I obtained the data from
Kalbfleisch JD and Prentice RL (2002). The Statistical Analysis of Failure Time Data (2nd edition), Wiley.
The original source is
Hoel DG (1972). A representation of mortality data by competing risks. Biometrics, 28:475-488.