NONPROFIT |
|||||
Variable |
N |
1988 |
1998 |
% CHANGE |
|
MEANS |
MEANS |
1988 to 1998 |
|||
|
--------- |
------ |
----------–-- |
-------––––------ |
----------–---- |
|
|
PRICE |
118 |
146.31 |
335.43 |
129.26% |
|
|
CITES |
118 |
6348.25 |
12540.22 |
97.54% |
|
|
PAPERS |
118 |
207.85 |
250.50 |
20.52% |
|
|
SUBSCRIPTIONS |
118 |
53.87 |
54.88 |
1.87% |
|
COMMERCIAL |
|||||
Variable |
N |
1988 |
1998 |
% CHANGE |
|
MEANS |
MEANS |
1988 to 1998 |
|||
|
--------- |
------ |
---------–--- |
---------––––---- |
----------–---- |
|
|
PRICE |
818 |
258.71 |
837.82 |
223.85% |
|
|
CITES |
818 |
1800.37 |
3167.54 |
75.94% |
|
|
PAPERS |
818 |
115.77 |
157.60 |
36.13% |
|
|
SUBSCRIPTIONS |
818 |
31.92 |
32.51 |
1.85% |
1. Subscriptions based on 194 libraries
2. Citations are for a five-year period, e.g. the 1998 citation number is based on cites to articles published during 1994–1998.
3. The papers number corresponds to the number of papers published in a single year.
4. All numbers are based on journals that existed in both years. Although the overall sample of such journals is larger than (818 + 118), some journals are eliminated from the analysis because prices are missing in either or both years, either due to missing observations or a change in the ISSN.
5. Journals sold by publishers with fewer than three titles are not considered.