# pr8.6
# A data set from Oehlert (2000) \emph{A First Course in Design and
# Analysis of Experiments}, New York: W. H. Freeman.
#
# Data originally from Richards, J.~A. (1965).  ``Effects of fertilizers
# and management on three promising tropical grasses in {J}amaica.''
# {\em Expl. Agric.\/}~{\em 1}, 281--288.
#
# Columns are height, fertilizer, interval, and response (cwt/acre).
# height: 1, 3, 6 inches.
# fert are 0, 8, 16, 32 cwt/acre.
# cutting interval are 1, 3, 6, 9 weeks.
ht	fert	int	y
1	0	1	74.1
1	0	3	65.4
1	0	6	96.7
1	0	9	147.1
1	8	1	87.4
1	8	3	117.7
1	8	6	190.2
1	8	9	188.6
1	16	1	96.5
1	16	3	122.2
1	16	6	197.9
1	16	9	232
1	32	1	107.6
1	32	3	140.5
1	32	6	241.3
1	32	9	192
3	0	1	61.7
3	0	3	83.7
3	0	6	88.8
3	0	9	155.6
3	8	1	112.5
3	8	3	129.4
3	8	6	145
3	8	9	208.1
3	16	1	102.3
3	16	3	137.8
3	16	6	173.6
3	16	9	203.2
3	32	1	115.3
3	32	3	154.3
3	32	6	211.2
3	32	9	245.2
6	0	1	49.9
6	0	3	72.7
6	0	6	113.9
6	0	9	143.4
6	8	1	92.9
6	8	3	126.4
6	8	6	175.5
6	8	9	207.5
6	16	1	100.8
6	16	3	153.5
6	16	6	184.5
6	16	9	194.2
6	32	1	115.8
6	32	3	160
6	32	6	224.8
6	32	9	197.5