Table 1.

Cluster analysis for the ozone data. “State ave trend” is the posterior mean of the average of the β(S) at the grid cells in the state.

State	Number of Monitors	Number of grid points	State ave trend	Prob state ave < −0.1	Proportion non-null	Post prob active
Alabama	25	234	−0.19	0.78	0.65	0.25
Connecticut	9	28	−0.38	0.97	0.92	0.86*
Delaware	6	8	−0.36	0.95	0.91	0.81*
Florida	43	235	−0.53	1.00	0.93	0.93*
Georgia	23	271	−0.54	1.00	0.96	0.97*
Illinois	35	277	−0.66	1.00	0.98	0.99*
Indiana	41	185	−0.32	0.98	0.84	0.68
Kentucky	32	195	−0.25	0.91	0.75	0.45
Maine	8	159	−0.51	0.99	0.94	0.90*
Maryland	19	55	−0.30	0.96	0.83	0.64
Massachusetts	14	36	−0.26	0.91	0.76	0.51
Michigan	26	296	−0.50	1.00	0.92	0.92*
Mississippi	8	220	−0.27	0.87	0.76	0.52
New Hampshire	13	46	−0.23	0.85	0.73	0.46
New Jersey	13	39	−0.27	0.92	0.81	0.59
New York	33	262	−0.15	0.65	0.59	0.18
North Carolina	41	227	−0.23	0.88	0.71	0.33
Ohio	48	202	−0.16	0.77	0.62	0.15
Pennsylvania	46	219	−0.23	0.90	0.70	0.20
Rhode Island	3	8	−0.47	0.99	0.98	0.96*
South Carolina	20	144	−0.42	0.98	0.89	0.81*
Tennessee	25	185	−0.25	0.89	0.73	0.41
Vermont	2	55	−0.18	0.69	0.63	0.34
Virginia	23	188	−0.25	0.88	0.73	0.40
West Virginia	9	115	−0.24	0.83	0.72	0.45
Wisconsin	31	292	−0.64	0.98	0.92	0.86*

States which is significant at α = 0.1 are denoted “*”.