Citation analysis examines the impact of a publication, an author or an institution, based on the number of times works and/or authors have been cited by others.
The citation data will relate only to articles indexed within the database. Variation may occur because the databases:
Read more: Citation analysis and databases containing citation information / Oulu University Library
The g-index weights highly-cited papers more heavily. An index of g means that your g most highly-cited articles together have at least g-squared citations. Your g-index will always be equal to or greater than your h-index.
Egghe, L. (2006). Theory and practise of the g-index. Scientometrics, 69(1), 131-152.
Contemporary h-index (hc-index)
The hc-index adds an age-related weighting to each cited article, giving less weight to older articles.
It gives more weight to recent and highly cited research than to older research, although maybe being highly cited.
Sidiropoulos, A., Katsaros, D., Manolopoulos, Y. (2006). Generalized h-index for Disclosing Latent Facts in Citation Networks.
Author's h-index means that
an author has published h papers each of which has been cited (by others) at least h times.
The value of h-index is affected by scientific field (different publishing and citation practices), length of researcher's career (longer time-window enables more publications and citations) and by total number of publications (h-index can't be larger than number of publications).
Author's h-index can be found in Web of Science (instructions), Scopus or Google Scholar.
University of Oulu: Evaluation based on scientific publishing-guide: h-index
Hirsch, J. E. (2005). An index to quantify an individual's scientific research output,
Normalized indicators show how a publication or group of publications performs relative to averages or baselines. The citation count of a publication is normalized by an average citation count through controlling research field, document type and publishing year, so that comparing sets of publications like research outputs of Universities would be meaningful. Even though basic idea is the same, different data providers name and count normalized indicators somewhat differently:
Top%- indicators - percentage of documents in top x% most frequently cited
The number or the proportion of researchers/groups/organizations publications that, compared with other publications in the same field and in the same year, belong to the top x % most frequently cited. Even though basic idea is the same, different data providers name and count normalized indicators somewhat differently: