Table 6. Sensitivity of model rankings to sample size: 1984 and 1985.

Variable versus fixed sample sizes	Model 1	Model 2	Model 3	Model 4	Model 5	Model 6	Model 7
Variable sample sizes
1984:
R2-percent	2.7	6.0	7.1	6.4	9.6	9.8	6.1
Sample size	(1,117)	(1,079)	(1,043)	(867)	(841)	(795)	(868)
1985:
R2-percent	2.5	7.7	4.8	6.6	10.8	13.0	6.5
Sample size	(1,054)	(1,020)	(983)	(830)	(805)	(761)	(831)
Fixed sample size
1984:
R2 – percent (N = 795)	1.2	4.4	4.5	5.4	8.3	9.8	5.6
1985:
R2 – percent (N = 761)	2.5	7.2	5.7	7.1	11.4	13.0	7.1

NOTES: Models are defined in Table 2. All R²s are adjusted.

SOURCE: The Framingham Study, Boston University; Health Care Financing Administration: Data from the Medicare Automated Data Retrieval System.