Table 1.

Simulation Results for Assessing the Tree Procedure: frequencies of the final tree sizes identified by the interaction tree (IT) procedure in 100 runs.

					Final Tree Size
Model	Sample Size	Validation Method	Censoring Rate	λ	1	2	3	4	5	6	≥ 7	Hits
A	450	test sample	0%	2	79	6	5	5	2	3	0	79
				3	93	5	2	0	0	0	0	93
				4	96	2	2	0	0	0	0	96
			50%	2	77	6	7	4	2	2	2	77
				3	94	3	2	1	0	0	0	94
				4	96	3	0	1	0	0	0	96
	300	bootstrap	0%	2	71	0	1	5	14	8	1	71
				3	87	2	3	3	3	2	0	87
				4	94	3	2	1	0	0	0	94
			50%	2	72	1	1	4	16	6	0	72
				3	94	1	2	2	1	0	0	94
				4	98	0	1	1	0	0	0	98
B	450	test sample	0%	2	0	0	4	57	12	11	16	68
				3	0	0	8	70	11	4	7	82
				4	0	0	10	75	9	2	4	88
			50%	2	1	6	11	33	14	12	23	46
				3	4	14	19	39	9	6	9	58
				4	9	20	29	32	7	2	1	62
	300	bootstrap	0%	2	0	0	1	26	35	30	8	42
				3	0	2	3	52	29	10	4	64
				4	0	2	6	66	20	5	1	79
			50%	2	1	0	5	15	39	33	7	34
				3	2	5	15	33	31	13	1	54
				4	3	12	24	34	20	7	0	59
C	450	test sample	0%	2	2	1	15	34	16	18	14	76
				3	2	6	23	39	13	12	5	83
				4	5	13	25	39	8	8	2	75
			50%	2	5	15	19	25	13	16	7	54
				3	16	17	26	23	9	6	3	56
				4	19	23	22	19	11	4	2	52
	300	bootstrap	0%	2	0	0	0	0	0	2	98	9
				3	0	0	0	11	5	5	79	33
				4	0	0	3	17	15	11	54	58
			50%	2	1	1	3	2	0	2	91	8
				3	1	3	14	10	5	4	63	34
				4	5	15	35	22	9	9	5	54
D	450	test sample	0%	2	23	29	16	13	6	11	2	17
				3	42	33	12	9	1	2	1	13
				4	55	31	12	1	0	1	0	10
			50%	2	49	19	10	7	9	5	1	7
				3	69	17	6	4	4	0	0	5
				4	90	8	0	2	0	0	0	2
	300	bootstrap	0%	2	9	14	9	15	19	21	13	19
				3	30	11	6	11	16	21	5	12
				4	52	15	11	9	6	4	3	13
			50%	2	33	15	12	11	10	11	8	15
				3	59	5	4	8	12	7	5	10
				4	81	4	3	5	5	1	1	9