Dataset: cc_cotton_pbib.dat

Source: W.G. Cochran and G.M. Cox (1957). "Experimental Designs, 2nd Ed.",
Wiley, NY. p. 456

Results of a cotton variety trial in a partially balanced incomplete block 
design, with 2 associate classes. 15 treatments in 15 blocks of size 4.
lambda1=0, lambda2=1.
Associate classes: (1,6,11), (2,7,12), (3,8,13), (4,9,14), (5,10,15)

Variables/Columns
Block   1-2
Treatment  4-5
Yield (pounds per plot) 7-9