A data set from Oehlert (2000) \emph{A First Course in Design and
Analysis of Experiments}, New York: W. H. Freeman.

Data originally from Giguere, V., G.~Lefevre, and F.~Labrie (1982). ``Site
of calcium requirement for stimulation of {ACTH} release in rat anterior
pituitary cells in culture by synthetic ovine corticotropin-releasing factor.''
{\em Life Sciences\/}~{\em 31}, 3057--3062.

Columns are verapamil, crf, calcium, and response.
Verapamil codes 1, 2 are 0 or 100 mu mole.
Crf codes 1, 2  are 0 or 100 n mole.
Ca codes 1, 2 are 0 or 2 mmole of CaCl2.