H index is a quantitative metric based on analysis of publication data using publications and citations to provide “an estimate of the importance, significance, and broad impact of a scientist’s cumulative research contributions”. The h-index evaluates the cumulative scholarly impact of an author’s performance. It measures the quantitative(productivity) and qualitative(citations) research work of a researcher as a single number meaning that neither few papers which are highly cited nor too many papers with very few citations will produce a high h-index.
h-index is based on a list of the publications ranked in descending order by the Times Cited count. The value of h is equal to the number of papers (N) in the list that have N or more citations.