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In some online databases such as DBLP some journals or conferences appear that are canceled or not appear at all after a few years. For what I know that is because, according to DBLP, the mentioned conference does not uphold with some criteria of quality to continue to appear on that database.

In Scimago, I have seen that a journal appeared indexed until 2016, but now it appears a message saying "Cancelled", what does it mean apart of the obviousness of that message? maybe that the journal has become a predatory one? or that it quality has decreased?

Any comments?

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Scimago seems to draw from Scopus' journal coverage (according to its About Us-page):

The SCImago Journal & Country Rank is a publicly available portal that includes the journals and country scientific indicators developed from the information contained in the Scopus® database (Elsevier B.V.).

Scopus regularly re-evaluates its journals. It even offers an Excel-list of recently discontinued journals (at the bottom of this page).

In that list, you can see the column Reason for discontinuation (column F). This should at least provide a vague keyword as to why a given journal was cancelled.

It seems that there are four such reasons:

  • "Metrics" (under-performance of a journal)
  • "Publication concerns" (I see journals from predatory publishers like OMICS who carry that reason).
  • "Radar" (outlier performance; "an algorithm that flags journals based on approximately 40 outlier predictors, including sudden change in output volume, sudden change in publishing country and/or affiliations, and high journal/author self-citation rates" -- citation from this F1000 article, at p. 14)
  • "do not meet Scopus criteria" (probably refers to Scopus' journal selection criteria, e.g. peer reviews, lack of publication delays, editorial board diversity, online availability of articles etc. As this Scopus blog post indicates, some journals are indeed simply discontinued by the publisher, which might fall under this reason.)

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