Source: https://mdanderson.libanswers.com/faq/26221
Indicators and h-index
There are many types of bibliometric indicators that measures scientific productivity, citation impact, outreach and visibility. H-index has become increasingly popular as an easy and concise way to measure publication activity, but what does it mean?
Basic bibliometric indicators
- number of publications and citations
- number of publications and citations per researcher
- number of citations per publication
- number of self citations
- number of uncited articles
- h-index
- Impact Factor
Basic indicators can not be used for comparisons between different subject areas.
Advanced bibliometric indicators
These indicators are always normalized, the publications are compared with other publications with similar prerequisites, for example the same area of research, the same year of publication, the same document type.
Some examples:
- field normalized citation score - eg. CPP/FCSm and MNCS
- field normalized top publications, Top 5%, indicates the section of publications from a research team that belongs to the 5% most cited in the world.
Field normalized indicators can be used for comparisons between subject areas.
Structural indicators
Publication patterns - sometimes displayed as maps of co-publication and -citation between researchers, co-publication between subject areas, co-publication with other organizations and other countries.
What is h-index?
h-index is a measure that takes both productivity and impact as indicated by number of citations into consideration. It can be calculated for a collection of publications, for example one researcher's production, the whole content of a journal or all publications from a research team. Index h is defined as the number of publications that have been cited h or more times.
How to calculate h-index
When you present indicate an h-index, it is important to specify the database used, and note at what point the h-index has been calculated. The following three databases have different coverage in terms of publications, and therefore can not get the exact same h-index .
Find and mark the publications that should be included in the analysis for the database you have chosen to work with.
- Web of Science: Click "Create Citation Report" in the upper right corner of the list of search results. This will take you to a new page containing citation statistics for all publications in your list, including h-index for the list.
- Scopus: In Scopus, click "View Citation Overview" in the upper left corner of your selected list.
- Google Scholar: Create an account in Google Scholar Citations to be able to select which publications should be included and to view the resulting h-index.
h-index for comparisons
From diverse citing cultures in different research areas follows that h-index will come out differently. H-indexes for researchers in physics are generally much higher than for researchers in social sciences for example. As h-index is based on total production of publications, it will grow with time; the longer a researcher has been active, the higher her or his h-index will become. If h-index is to be used for comparison, it is necessary to take the time dimension into account, and also to compare only with other researchers in the same area of research. Se also About bibliometrics. a crtitical approach.
Indicators on journal level
The Journal Impact Factor from Clarivate Analytics is much used, but there are other relevant journal ranking systems, as well as an increasing number of more or less deliberate falsifications.
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