Bibliometrics is a term encompassing the range of statistical analysis related to publications and their authors. This data is used to develop research impact “profiles” for specific individuals, papers, journals and disciplines, institutions and countries.
Each measure has advantages and disadvantages, related to discipline characteristics, inclusiveness of the measures, and the accessibility of the data; and no single measure should be used in isolation.
A number of databases provide quality citation data about individual papers. They show when and where an original paper has been cited, and by whom, providing an opportunity to learn about other researchers within or related to a discipline as well as illustrating "impact" of that paper.
These are the main, multi-disciplinary sources of citation data:
The Open Access Repository (ePrints) counts the "downloads" for individual items it contains and shows the diversity of countries where these have occurred. With content in ePrints searchable via Google, these counts could be used as an indicator of researchers' impacts on peers and the broader community.
If you're an author of a book, you may be interested in its distribution across the world's libraries.
Altmetrics can measure online engagement by collecting data on:
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Over time, your research output might attract activity like this:
Analysis of citation data, rather than just its collection, has become a value-added service of some databases now.
Contemporary h-index (hc-index)