3x3 Contingency Table for the Relationship of
Impact Factor to UnCover Use^*

		UnCover Use
	Low 1 Use per Title (310 Uses; 11.7% of Use)	Medium 2–6 Uses per Title (977 Uses; 36.7% of Use)	High 7–198 Uses per Title (1,372 Uses; 51.6% of Use)	TOTALS
Not Covered Titles not covered in the 1994 JCRs	119** 103.6 50.0% 38.4%	109 108.0 45.8% 33.8%	10 26.4 4.2% 12.7%	238 titles 33.4% of impact factor titles
Low Titles below median impact factor of the largest 1994 JCR subject group in which listed	97 92.3 45.8% 31.3%	96 96.2 45.3% 29.7%	19 23.5 9.0% 24.1%	212 titles 29.8% of impact factor titles
High Titles above median impact factor of the largest 1994 JCR subject group in which listed	94 114.1 35.9% 30.3%	118 118.9 45.0% 36.5%	50 29.1 19.1% 63.3%	262 titles 36.8% of impact factor titles
TOTALS	310 titles 43.5% of use titles	323 titles 45.4% of use titles	79 titles 11.1% of use titles	712 titles 100.0% of titles

*Chi-square = 32.2; null hypothesis rejected at less than the 0.0001 level of significance. Kendall's tau-b = 0.153; significant at less than the 0.0002 level.

**Cell Numbers in Descending Order = Observed Frequency, Expected Frequency, % Impact Factor Titles in Its Row, % UnCover Use Titles in Its Column.