where:
Progress = 1 if journal's ranking improved between 2004 and 2010. Otherwise, Progress =
0.Score04 = Number of citations 2001–2004/Number of articles in 2001.Intscore10 = Citations for
international articles/Number of international articles 2007–2008.Intchange = % change in
journal's international contents between 2001 and 2007–2008.
Hypothesis 2 concentrates on citation scores rather than rankings. An OLS regression model is used
since the dependent variable (Score10) is a continuous variable. The null hypothesis is:
H0. A journal's citation score is independent from its increased focus on international topics.
The model takes the following form: