https://www.mitpressjournals.org/doi/pdf/10.1162/qss_a_00066

University of Michigan - Ann Arbor

1. Number of COVID-19 documents were collected from main candidates of databases using same search queries between the dates March 21, 2020 and  April 18, 2020 daily. 
2. Scores for matching documents on Mendeley and Altmetrics.com were gathered and compared
3.  A March 24 data set was created to track a set of documents indexed on the same day

Methods for study done on COVID-19 publications: Database coverage, citations, readers, tweets, news, Facebook walls, Reddit posts

Tables 8 and 9 show the Spearman correlations between citation counts and altmetrics for COVID-19 journal articles with statistically significant values for all impact indicators. 

Results for study on COVID-19 publications: Database coverage, citations, readers, tweets, news, Facebook walls, Reddit posts

It's important to note the limitations on the study, especially the coverage figures for the sources are not directly comparable due to the different scopes of the queries. In addition, the count data has not been field-normalized, so the coverage comparisons do not reveal disciplinary differences. Not taking into account disciplinary difference may have also exaggerated correlations.

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