  Accurately assigning the document type of review articles in citation index
databases like Web of Science(WoS) and Scopus is important. This study aims to
investigate the document type assignation of review articles in web of Science,
Scopus and Journals' website in a large scale. 27,616 papers from 160 journals
from 10 review journal series indexed in SCI are analyzed. The document types
of these papers labeled on journals' website, and assigned by WoS and Scopus
are retrieved and compared to determine the assigning accuracy and identify the
possible reasons of wrongly assigning. For the document type labeled on the
website, we further differentiate them into explicit review and implicit review
based on whether the website directly indicating it is review or not. We find
that WoS and Scopus performed similarly, with an average precision of about 99%
and recall of about 80%. However, there were some differences between WoS and
Scopus across different journal series and within the same journal series. The
assigning accuracy of WoS and Scopus for implicit reviews dropped
significantly. This study provides a reference for the accuracy of document
type assigning of review articles in WoS and Scopus, and the identified pattern
for assigning implicit reviews may be helpful to better labeling on website,
WoS and Scopus.
