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Impact factor measure for many journals is available using the Journal Citation Reports. As you investigate a particular journal, it is good to also look at the summary information for your discipline or field of study. As a general rule, these journal measures are not comparable across disciplines.
In addition to this service, there are studies which have used the H-index concept and applied it to journals. To see if there is a study such as this for your file
Impact measures at the article level vary over time and are not absolute. They include:
Your h-index is a threshold measure which will change over time. It is an attempt to measure the productivity (number of publications) and impact of those publications as measured by how many times they have each been cited. A scholar with an h-index of 10 has published 10 papers each of which has been cited in at least 10 other papers. (excluding self-citation).
Computing an H-index value for your publications will vary by the tool(s) you choose.
The second order h(sub2) index may be useful in ranking researchers/institutions. It defines a index of X for an author or collection of authors (an institution) as that number of publications they have written which have been cited in at least X articles each of which has also been cited in at least X articles.
As with any citation-based metric, the h-index and the h(sub2) index lose some validity when applied across disciplines because rates of citation vary across disciplines.
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