  There has been a generalization in the use of two publication practices by
scientific journals during the past decade: 1. 'article in press' or early
view, which allows access to the accepted paper before its formal publication
in an issue; 2. 'open access', which allows readers to obtain it freely and
free of charge. This paper studies the influence of both publication modalities
on the average impact of the journal and its evolution over time. It tries to
identify the separate effect of access on citation into two major parts: early
view and selection effect, managing to provide some evidence of the positive
effect of both. Scopus is used as the database and CiteScore as the measure of
journal impact. The prevalence of both publication modalities is quantified.
Differences in the average impact factor of group of journals, according to
their publication modalities, are tested. The evolution over time of the
citation influence, from 2011 to 2016, is also analysed. Finally, a linear
regression to explain the correlation of these publication practices with the
CiteScore in 2016, in a ceteris paribus context, is estimated. Our main
findings show evidence of a positive correlation between average journal impact
and advancing the publication of accepted articles, moreover this correlation
increases over time. The open access modality, in a ceteris paribus context,
also correlates positively with average journal impact.
