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Altmetrics have been proposed as a way to assess the societal impact ofresearch. Although altmetrics are already in use as impact or attention metricsin different contexts, it is still not clear whether they really capture orreflect societal impact. This study is based on altmetrics, citation counts,research output and case study data from the UK Research Excellence Framework(REF), and peers' REF assessments of research output and societal impact. Weinvestigated the convergent validity of altmetrics by using two REF datasets:publications submitted as research output (PRO) to the REF and publicationsreferenced in case studies (PCS). Case studies, which are intended todemonstrate societal impact, should cite the most relevant research papers. Weused the MHq' indicator for assessing impact - an indicator which has beenintroduced for count data with many zeros. The results of the first part of theanalysis show that news media as well as mentions on Facebook, in blogs, inWikipedia, and in policy-related documents have higher MHq' values for PCS thanfor PRO. Thus, the altmetric indicators seem to have convergent validity forthese data. In the second part of the analysis, altmetrics have been correlatedwith REF reviewers' average scores on PCS. The negative or close to zerocorrelations question the convergent validity of altmetrics in that context. Wesuggest that they may capture a different aspect of societal impact (which canbe called unknown attention) to that seen by reviewers (who are interested inthe causal link between research and action in society).

journal of informetrics

Do altmetrics assess societal impact in a comparable way to case  studies? An empirical test of the convergent validity of altmetrics based on  data from the UK Research Excellence Framework (REF)