There are multiple indexing systems available for the journals. Which indexing system is the best for the journals?
And what about the Q1, Q2, Q3 or Q4 status of the journals?
Also what about the PubMed, Scopus indexing, SCImago Journal Rank (SJR)?
Dear Prof. Dr. Binaya Sapkota,
Explanation regarding indexing system of the journals.
TOOLS FOR UNDERSTANDING IMPACT INDEXES
There are several tools which enable users to look up and automatically calculate the impact indicators of the most important scientific journals:
Journal Citation Reports (JCR):
It includes publications reviewed by the most widely-cited experts in the world and covers approximately 200 different disciplines. JCR can be accessed online via the Web Of Science platform (WOS) and can be used to run online searches and look up the Impact Factor of a given journal or a group of journals and make comparisons between these. The impact factor is calculated annually by the Institute for Scientific Information (ISI).
SCIMAGO Journal and Country Rank (SJR):
This ranking emerged as a free-of-charge alternative to JCR. It analyses publications indexed in the Scopus database which is provided by the publisher Elsevier, dating from 1997 to the present. SJR enables users to run online searches using the Scopus platform, which is a paid-for tool, or using the SCIMAGO Journal and Country Rank-SJR.
IMPACT FACTOR CALCULATION IN THE JOURNAL CITATION REPORT (JCR):
One way of determining the impact factor of a journal is by looking at the average number of times, in one year, that articles published in the previous two years have been cited.
A simple formula is used to calculate the Impact Factor (IF):
The total number of citations received in the previous two years
divided by
the total number of articles published in those previous two years
IMPACT INDEX CALCULATION BY SJR:
The SJR impact index was developed based on the algorithm that was conceived by Google to organise its search results (Google PageRank). This means that not all citations carry the same value: rather, their value depends on the position of the magazine cited. This means, for example, that a citation from a journal with a high SJR index will have a greater value than a citation from a journal with a lower SJR index.
SJR details the number of links that a journal receives based on the weighted citation of its documents relative to the number of documents published in that year by each publication. The weighting of the citations is based on those received by the citing publication.
The citation period is three years - one year longer than JCR - and it can be calculated on a yearly basis from 1999, although data from Scopus publications have been compiled since 1996. In addition to this, the calculation disregards citations to documents published within the journal itself.
QUARTILES:
In addition to the Impact Factor or Impact Index, rankings of journals in each subject category are divided into quartiles by both JCR and SJR.
These quartiles rank the journals from highest to lowest based on their impact factor or impact index. There are four quartiles: Q1, Q2, Q3 and Q4.
Q1 is occupied by the top 25% of journals in the list; Q2 is occupied by journals in the 25 to 50% group; Q3 is occupied by journals in the 50 to 75% group and Q4 is occupied by journals in the 75 to 100% group.
The most prestigious journals within a subject area are those occupying the first quartile, Q1. The importance of the other journals declines as we move down through the quartiles.
DIFFERENCES BETWEEN JCR AND SJR:
One of the most important differences between SJR and JCR is the access that they provide:
Another important difference between JCR and SJR relates to the variability of indicators:
In terms of the citation data collected for calculating indicators:
METRICS FOR JOURNALS: OTHER INDEXES
The relatively small number of non-English-language journals and the fact that very few journals about Humanities and Social Sciences appear in the Web Of Science list and, by extension, in JCR has meant that in some countries, such as Spain, alternative tools have been created to measure the impact factor of journals.
We will now outline a series of tools which offer other indices that can be used to measure the quality of publications. This is a small selection of the tools that are currently available.
METRICS FOR JOURNALS: THE H-INDEX
The H-Index was created by Jorge E. Hirsch in 2005. It has since gained popularity and is applied to both metrics for journals and other metrics which apply specifically to authors. It can also be used to measure scientific productivity in different countries.
The h-index is based on a simple calculation which is used in a similar fashion regardless of the concept to be measured: this calculation involves ranking scientific articles from the highest to the lowest according to the number of citations that each one has received. The h-index is the point at which the article’s number in the ranking matches the number of citations that it has received.
I hope the information will help you.
With Best Wishes,
Samir G. Pandya
Binaya Sapkota Thank you for your question. The Web of Science is usually preferred by universities and funding bodies, particularly regarding the total number of citations obtained by published articles of a researcher/or department. Scopus is also widely used and is a parallel database that many academics and researchers use worldwide. PubMed database is freely available and covers publications in biomedical sciences, medical sciences and subspecialties. However, the journals are not classified into categories and no classification for articles available in this database. Google Scholar is freely available but not organised, and its filter is not that sensitive to search words used.
Because not all journals listed in the Web of Science are at the same level of quality, and there are wide variations in the journal's impact factor (JIF) under the same discipline, the Web of Science grouped papers in each discipline under four categories Q1 to Q4 depending on the JIF. Therefore Q1 represents journals with the highest JIF.
As researchers, we are forced to adopt journal ranking/indexing systems. WOS and Scopus are the most widely used. However, do they really matter?
Dear Prof. Dr. Binaya Sapkota,
Explanation regarding indexing system of the journals.
TOOLS FOR UNDERSTANDING IMPACT INDEXES
There are several tools which enable users to look up and automatically calculate the impact indicators of the most important scientific journals:
Journal Citation Reports (JCR):
It includes publications reviewed by the most widely-cited experts in the world and covers approximately 200 different disciplines. JCR can be accessed online via the Web Of Science platform (WOS) and can be used to run online searches and look up the Impact Factor of a given journal or a group of journals and make comparisons between these. The impact factor is calculated annually by the Institute for Scientific Information (ISI).
SCIMAGO Journal and Country Rank (SJR):
This ranking emerged as a free-of-charge alternative to JCR. It analyses publications indexed in the Scopus database which is provided by the publisher Elsevier, dating from 1997 to the present. SJR enables users to run online searches using the Scopus platform, which is a paid-for tool, or using the SCIMAGO Journal and Country Rank-SJR.
IMPACT FACTOR CALCULATION IN THE JOURNAL CITATION REPORT (JCR):
One way of determining the impact factor of a journal is by looking at the average number of times, in one year, that articles published in the previous two years have been cited.
A simple formula is used to calculate the Impact Factor (IF):
The total number of citations received in the previous two years
divided by
the total number of articles published in those previous two years
IMPACT INDEX CALCULATION BY SJR:
The SJR impact index was developed based on the algorithm that was conceived by Google to organise its search results (Google PageRank). This means that not all citations carry the same value: rather, their value depends on the position of the magazine cited. This means, for example, that a citation from a journal with a high SJR index will have a greater value than a citation from a journal with a lower SJR index.
SJR details the number of links that a journal receives based on the weighted citation of its documents relative to the number of documents published in that year by each publication. The weighting of the citations is based on those received by the citing publication.
The citation period is three years - one year longer than JCR - and it can be calculated on a yearly basis from 1999, although data from Scopus publications have been compiled since 1996. In addition to this, the calculation disregards citations to documents published within the journal itself.
QUARTILES:
In addition to the Impact Factor or Impact Index, rankings of journals in each subject category are divided into quartiles by both JCR and SJR.
These quartiles rank the journals from highest to lowest based on their impact factor or impact index. There are four quartiles: Q1, Q2, Q3 and Q4.
Q1 is occupied by the top 25% of journals in the list; Q2 is occupied by journals in the 25 to 50% group; Q3 is occupied by journals in the 50 to 75% group and Q4 is occupied by journals in the 75 to 100% group.
The most prestigious journals within a subject area are those occupying the first quartile, Q1. The importance of the other journals declines as we move down through the quartiles.
DIFFERENCES BETWEEN JCR AND SJR:
One of the most important differences between SJR and JCR is the access that they provide:
Another important difference between JCR and SJR relates to the variability of indicators:
In terms of the citation data collected for calculating indicators:
METRICS FOR JOURNALS: OTHER INDEXES
The relatively small number of non-English-language journals and the fact that very few journals about Humanities and Social Sciences appear in the Web Of Science list and, by extension, in JCR has meant that in some countries, such as Spain, alternative tools have been created to measure the impact factor of journals.
We will now outline a series of tools which offer other indices that can be used to measure the quality of publications. This is a small selection of the tools that are currently available.
METRICS FOR JOURNALS: THE H-INDEX
The H-Index was created by Jorge E. Hirsch in 2005. It has since gained popularity and is applied to both metrics for journals and other metrics which apply specifically to authors. It can also be used to measure scientific productivity in different countries.
The h-index is based on a simple calculation which is used in a similar fashion regardless of the concept to be measured: this calculation involves ranking scientific articles from the highest to the lowest according to the number of citations that each one has received. The h-index is the point at which the article’s number in the ranking matches the number of citations that it has received.
I hope the information will help you.
With Best Wishes,
Samir G. Pandya
An indexed journal is one that is indexed in various databases, depending on the discipline. There are databases that index journals from various disciplines, such as the citation index, and there are more specialized index such as index medicus that index mainly journals in medicine. Nevertheless, Other than Scopus and Google scholar, ESCI is also good.