A research paper from one's thesis is not considered as plagiarism as generally evaluators of the thesis and interviewers suggest it. As regard plagiarism, there is zero tolerance in terms of results of analysis and findings. To some extent to me language comparability may be overlooked. My university is client of a highly reputed  plagiarism software and I used it to check one of my paper, I was shocked that there was 70% comparability from internet and published sources. I did not believe and wrote a page  on another topic which I have never considered under my field. I was again shocked that software returned that my one page writeup was 90% from Wikipedia. Therefore, I have a soft opinion regarding language comparability index.

As far as I'm concerned, you are allowed to publish your own thesis. Or maybe my previous advisor told me we were going to publish some of my results as long as there were plenty of them? Yup, I may have remembered something wrong. Anyway, it's wise to carry out many tests, so you can pick the ones you are going to publish and chose the ones you'd use in your thesis.

A research paper from one's thesis is not considered as plagiarism as generally evaluators of the thesis and interviewers suggest it. As regard plagiarism, there is zero tolerance in terms of results of analysis and findings. To some extent to me language comparability may be overlooked. My university is client of a highly reputed  plagiarism software and I used it to check one of my paper, I was shocked that there was 70% comparability from internet and published sources. I did not believe and wrote a page  on another topic which I have never considered under my field. I was again shocked that software returned that my one page writeup was 90% from Wikipedia. Therefore, I have a soft opinion regarding language comparability index.

I think we must make a clear-cut difference between a plagiarism and similarity index. To me a plagiarism is copying an original data and ideas and to publish them by one's own name, while similarity index is based on the similarity of words, sentences, phrases etc. The similarity index is ridiculous in my opinion as it shows a superficial plagiarism as I reckon. It will show the similarity of the articles, helping verbs, references etc. Scientists must agree to avoid actual plagiarism instead of avoiding similarity of words. Most of the journals currently consider the permission of similarity below 15~20%. 

And regarding publishing from own thesis I will agree with Mohammad Firoz Khan.

Usually less than or equal to 19% similarity index is acceptable, so try your best to reduce it as much as possible and keep yourself  in safe side when you submitting a research article.

I agree with Qaisar Mahmood opinion, as you can't 100% avoid similarity index and generally reviewers and Editors over look if it's under 20%. But to minimize it is the best option.

@Tasiu Isah

I think Turnitin can be a good software to detect similarity of your work with published literature.

You can opt for iThenticate or Turnitin softwares.

Dear Imran

The word plagiarism is offensive and insulting to any researcher, therefore your work should contain 0 plagiarism. You must be able to produce your own work in your own way whatever the results were. Your contribution is the most critical and important issue in any project. Copy and past 8 sequential words is considered as plagiarism. Also, using other people thoughts and ideas as our novel ideas is considered as plagiarism. 

regards

Hi,

from my experience, you have up to 80% of your thesis marital allowed to be copy-past in to a manuscript. but since a manuscript has to be shorter in introduction and method description, specific in result description, and direct in discussion you will need to re-form your enter wording to fit the manuscript requirements. 

good luck

Dear Researcher,

It's a good question basically many students and upcoming research scholars has to know few important facts about this... and as an executive editor of few National and International journals and a part of world's largest health information provider "Elsevier" I would like to clear you from these issues...

All the best. Hope this might help you and let me know if you still need any information.

In my opinion not, if the thesis had not already been published.

Theses typically fall under "gray literature" - as long as the author of that thesis is simply publishing parts of that thesis research in peer reviewed journals, that should be perfectly acceptable.

However, plagiarism itself is a very serious issue. "Accidental" plagiarism - like forgetting to include a citation - is usually pretty noticeable, but intentional plagiarism should be dealt with harshly.

Dear Imran,

In case you have a chance to publish your work through articles before handing over your thesis, I would suggest you to do so.

Firstly, that would avoid any confusions related to thesis-articles plagiarism.( Even though I agree with Mohammad Firoz Khan)

Secondly, that would ease your viva in the sense that if your work has already been recognized by reputable journals, it means that your results are valid. Hence, you are somehow being supported indirectly.

All the best.

Research paper from own thesis cannot be considered as plagiarism. As long as your thesis is unpublished in any form like book chapter , monograph , conference proceedings etc. You can proceed with your journal publications from your own thesis.

Actually research paper from our own thesis should not considered as plagiarism since we cited clearly the reference. And actually there are problem in language for description of results and analysis, since we in our community speak in similar language and vocab it is difficult to avoid similarity or make difference, so the best way is we must cited the reference. Unfortunatelly for several people, whom lack of access of paper the might notified as plagiat although she or he did the research or writing the paper on her/his own words.

All the best

Dear Tasiu 

My university uses turnitin. It is also freely available for student from internet.

From my knowledge, not more than 25% but I would like to hear about what other researchers have to say

According to trunitin  which labeling their results on colors 

green which is from 1%to - 24% similarity index and means normal. or accepted 

yellow 25-49% similarity index which is the second stage which means high. as

orange (50-74% similarity index) and also red (75-100% similarity index).

at the end from field to another is different.  

yes.  a research paper from the own thesis is considered as self-plagiarism

This is a very serious case in most of the universities and specially when you have to be an opponent of a thesis. I would say from 5% above, excluding references and other minor language compatibilities, it should not be allowed. This is what we practice here in Tartu. Some theses students take sentences from articles and clearly such actions should be penalised. 

Research papers of your own is considered as a self-plagiarism, and some communities do not allow it, e.g., IEEE Communications

Well, being an AE of a reputed International Journal, I can tell that most of the Journals prefers similarity index below 15%. Sometimes it may be 20% but it depends on how much it is with the other text materials. Anything below 15% is acceptable but may be sometimes 20% is also acceptable.

Yes I'm agree with Dr. Arkoprovo. Few months back I was communicating with chief editor of some journal under Elsevier brand. However, he told me that it's always better to reduce the similarity index below 10%. Different publishers having different policies. Springer policiy is less than 15% but exception can be made for novelity upto 20% while willey, sage do not allow more than 10%.

As far as concern to plagiarism, different publication house and journals have their own criteria and guidelines to accept the research paper. Some journals specifically mentioned that upto 10,15 and 20 percent plagiarism is allowed in non-core area of the research while some journals taking it as confidential. But high impact factor journals are very strict about norms of plagiarism. There is no exact figure or data about plagiarism for the acceptance of research paper. So, go through the guidelines of journal and follow it rigoursly in which you want to publish your research paper.

Should an authos who’s paper has been plagiarized should report that in researchgate? And if yes, how? As a comment on the original paper? Or as a comment in the plagiarized version? If the author itself comments, it might look like selfish, or not? On the other hand, the community should become aware of this issue and should provide some countermeasures. Also I got the feeling from the aboved discussion, it is hard to draw a borderline, 20%, 40%, 60%, and does only copied text counts or even the basic concept, idea?

from 1 to 25 % may acceptable .

This is dependent upon the "plagiarized" section and in-depth analysis of the detailed similarity report. 1% from a single source may be acceptable regardless of the total percentage. Also, materials and methods can be disregarded researchers uses similar techniques in their works.

I have replied in detail to this post earlier. As I mentioned whatever sentences you write somebody might have written those sentences earlier in some other context. Therefore, idea of language similarity does not go very far. We should consider plagiarism as plagiarism of ideas and thought. Language similarity detection may help but may fail sometimes altogether to detect plagiarism of ideas and thought. It be left to a human expert authority in the field not to machine that runs on an algorithm.

@Mohammed Firoz Khan, I totally agree with your thoughts. I think similarity check softwares will lead to high plagiarism percentage in the near future as english has a limited number of sentence and/or paragraph combination that would not satisfy the increasing number of researchers; thus written papers.

I think 10 to 15% is acceptable

For Elsevier Journals-

I think 15% is acceptable