Dataset:  trouthead.dat

Source: C. McC. Mottley (1941). "The Covariance Method of Comparing
the Head-Lengths of Trout From Different Environment," Copeia,
Vol.1941, #3, pp. 154-159

Description: Head-Lengths and Standard-Lengths of 50 male and 50
female trout from Kootenay Lake and 10 male and 10 female trout
from Lake Wilson.

Variables/Columns
Gender   8  /*  1=M, 2=F  */
Lake    16   /* 1=KL, 2=LW   */
Head-Length (mm)  22-24
Standard-Length (mm)  30-32