Table 4.

Year to year correlations for impact scores per journal class in five Journal Subject Categories, 2004

Journal class	y1–y2	y2–y3	y3–y4	y4–y5	y5–y6	y6–y7
Biochemistry and molecular biology
1–50	0.81	0.99	0.99	1.00	1.00	1.00
51–100	0.89	0.99	1.00	1.00	1.00	1.00
101–150	0.99	1.00	1.00	1.00	1.00	1.00
151–200	0.96	0.99	1.00	1.00	1.00	1.00
201–250	0.99	1.00	1.00	1.00	1.00	1.00
251–	0.98	1.00	1.00	1.00	1.00	1.00
Economics
1–20	0.54	0.90	0.97	0.99	1.00	1.00
21–30	0.89	0.96	0.99	0.99	1.00	1.00
31–40	0.76	0.97	0.99	0.99	1.00	1.00
41–50	0.62	0.97	0.99	1.00	1.00	1.00
51–75	0.89	0.98	0.99	1.00	1.00	1.00
76–	0.65	0.94	0.99	0.99	1.00	1.00
Information and library science
1–15	0.72	0.86	0.97	0.99	1.00	1.00
16–25	0.20	0.88	0.97	0.99	1.00	1.00
26–35	0.98	0.83	0.95	1.00	1.00	1.00
36–50	0.69	0.88	0.98	0.99	0.99	1.00
51–	0.92	0.98	0.99	0.99	1.00	1.00
Mathematics
1–30	0.84	0.97	0.98	0.98	1.00	1.00
31–45	0.78	0.96	0.98	0.99	0.99	1.00
46–60	0.69	0.96	0.99	1.00	1.00	1.00
61–100	0.86	0.98	0.99	0.99	1.00	1.00
101–150	0.92	0.97	1.00	1.00	1.00	1.00
151–	0.83	0.95	0.98	1.00	1.00	1.00
Pathology
1–35	0.76	0.97	0.99	1.00	0.99	1.00
36–70	0.79	0.97	0.99	1.00	1.00	1.00
71–150	0.83	0.99	1.00	1.00	1.00	1.00
151–	0.97	1.00	1.00	1.00	1.00	1.00