Example data for the Lab4IQM Biostatistics module. Read them as "biostat:<file>",
e.g. km("biostat:leukemia.csv", time=weeks, event=relapse, group=drug).

leukemia.csv   Remission times (weeks) of 42 children with acute leukemia, 6-MP vs
               placebo; relapse = 1, still in remission (censored) = 0.
               Freireich EJ et al. Blood 1963;21:699-716 (as in Gehan 1965).
plants.csv     Dried plant weights under a control and two treatments, 10 each.
               Dobson AJ. An Introduction to Statistical Modelling, 1983 (Table 7.1).
biomarker.csv  SIMULATED: 200 people, age, smoking, disease (yes/no) and two markers.
doses.csv      SIMULATED: cell viability (%) for 9 drug concentrations (uM), 3 replicates;
               true IC50 0.8 uM, Hill slope 1.2.
The simulated files are made by tools/make_data.py in the source repository.
