/* these data are taken from p. 91 of Fisher's
(as in Sir Ronald A. Fisher) classical text 
"The Design of Experiments."
*/

36 observations in rows and columns:

633 527 652 390 504 416
489 475 415 488 571 282
384 481 483 422 334 646
620 448 505 439 323 384
452 432 411 617 594 466
500 505 259 366 326 420

design information for rows and columns:

E B F A C D
B C D E F A
A E C B D F
F D E C A B
D A B F E C
C F A D B E


the treatments denoted by these labels:
A - nitrogen=0, phosphate=0
B - nitrogen=0, phosphate=single
C - nitrogen=0, phosphate=double
D - nitrogen=1, phosphate=0
E - nitrogen=1, phosphate=single
F - nitrogen=1, phosphate=double