There is NO mutual cooperation between such academic platform, in other words, there is no unifying of the gained data base between these academic sites.

Regards,

Emad

Hi,

It seems that every database producer relies on a group of researchers who are always trying to improve bibliometric indicators, and that is the reason why each database has its own H-index. The databases cannot update the incoming material as quickly as a search engine, since in databases there are screening process of incoming material while the search engine indexes everything automatically, and it does not have the analytical functions that a database has.

There is NO mutual cooperation between such academic platform, in other words, there is no unifying of the gained data base between these academic sites.

Regards,

Emad

Because the indexed journals with each one ae different: Google Scholar indexes everything, even predatory journals, RG is more selective and SCOPUS is the most selective and therefore, its h-index is the most official.

Your right Emad Kamil Hussein sir

Hi

h index depends on the number of citations on a given period of 3 years (for the usual h index).

The number of citations depend on the number of journals referenced in the base.

Web of Knowledge has the fewer number of journals, compared to scopus, Scholar and researchgate. It is why the h index is lower with WOK.

Then Scopus gives usually a higher h index because it gets about 12% more journals indexed than WOK.

Then Researchgate gives a higher h index, as there are much more scientific material referenced in RG, just because in RG people can uplaod any scientific production, even if it is not a paper in the selection of journals you can find on WOK or Scopus (in RG you can uplaod conference papers, posters, research notes, PhD and Master memories, maps, etc...)

The higher h index you can find for an individual is on Google Scholar, because it contents even more results than RG. As a difference with RG, Scholar references everything that can be found on the web, when the RG content depends on what peoiple upload on it.

I wrote a short note on this.

best

Gil

Hi,

In the analysis of the various indexing databases, there is a need to add information on the different purposes and characteristics of each. If the PoP was the best indexing production then it is possible that promotion committees in universities would have used this H-index of Impact Factor source, but this is not the case. There is a question of selectivity and reliability, and for academic promotions and ranking usually the WoK is used.

In France and in many countries of Africa scopus is used at the same level than WOK.

And about the reliability it is true that there are many publications indexed by scholar and available on RG that are less reliable than others, but the other side of this system is that clarivate analytics and else vier are the real power of science... as they created the indexes that our administration use to assess our work... and they own many of the international journals in which we are due to publish if we want to see our indexes rise up...

Time has come to propose alternatives to this ...

Interesting information.

Agree with Abdulrahman and Mahe.

There is no centralized database for indexing. As such different h-index happens.

Thank you all for sharing your views.

@Prof. Gil Mahe: Thanks of sharing the write-up. It is quite handy indeed.

good answers guys....

Producer wants to make it different to make attention of researcher.

Hi everyone

I agree with Mohammad Younis ,

There are not a common database among these three platforms.