Cushing's syndrome is a hypertensive disorder associated with over-secretion of cortisol by the adrenal gland. The observations are urinary excretion rates of two steroid metabolites.
The
Cushings
data frame has 27 rows and 3 columns:
a
(adenoma) ,
b
(bilateral hyperplasia),
c
(carcinoma) or
u
for unknown.
J. Aitchison and I. R. Dunsmore (1975) Statistical Prediction Analysis. Cambridge University Press, Tables 11.1-3.