Heart Catherization Data, from Weisberg (1980)

A catheter is passed into a major vein or artery at the femoral region
and moved into the heart. The proper length of the introduced catheter
has to be guessed by the physician. The aim of the Data is to describe
the relation between the catheter length and the patient's height.

12 subjects, 4 variables:

 1. Index (i)
 2. Height (x[1], in inches)
 3. Weight (x[2], in pound)
 4. Catheter Length (y, in centimeters)