[LON-CAPA-users] Plagiarism check in grading interface...

Mills, Douglas G dmills at illinois.edu
Fri Aug 10 13:48:56 EDT 2012


Couldn't a similarity report change for a given student if another student,
meanwhile, had submitted a similar response?


On 8/10/12 12:41 PM, "Raymond Batchelor" <batchelo at sfu.ca> wrote:

> The problems I am grading are two-part problems.  The first part is machine
> graded radiobuttonresponse and the SECOND part is the essay for which I want
> the plagiarism check.
> 
> From what my TA tells me, I infer that the plagiarism check WORKED for them
> PRIOR to grading the students, but afterward it did not.
> i.e. She could get %similarity reported for multiply-selected students,
> beforehand, but NOT after grading was completed.
> 
> I 'believed' that I saw a different similarity report for the same student for
> the same resource (i.e. a match to a different student's submission).  However
> I could easily have been mistaken, because I had tried the check so many
> times, on so many resources, for numerous students and from different servers.
> Heh.
> 
> So, I would assume you are correct about that part of it and I probably got
> confused (unless I can reproduce an incidence of this possible phenomenon).
> 
> Thanks for the patch.
> 
> Cheers,
> Ray
> 
> 
> 
> ----- Original Message -----
> From: "Stuart Raeburn" <raeburn at msu.edu>
> To: lon-capa-users at mail.lon-capa.org
> Sent: Thursday, 9 August, 2012 22:54:53
> Subject: Re: [LON-CAPA-users] Plagiarism check in grading interface...
> 
> Hi,
> 
>> I am puzzled about the plagiarism check.
> 
> Thank you for reporting this.
> 
>> I previously had observed that at least some kind of check in
>> grading/viewing interface worked for multiply selected students in a
>>  course.
> 
> Yes, it looks as though checking for multiply selected students worked
> in LON-CAPA 2.4 and older, but not thereafter, as a change made while
> addressing bug 5363 (http://bugs.loncapa.org/show_bug.cgi?id=5363)
> apparently restricted this to one student selected each time.
> 
> Anyway the resolution of this issue is discussed in my comment #5
> added to bug #5712 today. The required change has been included in the
> forthcoming LON-CAPA 2.11.0 release.
> 
> The bug report ( http://bugs.loncapa.org/show_bug.cgi?id=5712 ) also
> discusses how to address this issue for institutions running the
> current (2.10.1) release.
> 
>> Also, it returns different results  for that one person.
> 
> By different results do you mean the percentage similarity, and/or the
> identity of the submitter with a similar submission above threshold
> would change between grading passes?
> 
> I would be surprised to see that, given that the code iterates over
> all the submissions recorded for the particular resource, and reports
> the one with the highest similarity.
> 
> Does the resource have a single essayresponse item, or are there
> multiple essayresponse items? The mechanism used for archiving
> submissions for later similarity checking was not designed to
> accommodate multiple essayresponses in a single resource.
> 
> I would be curious if you still see different results for one
> particular student when you make different grading passes, when using
> 2.11.0 (which includes the change mentioned to support multiply
> selected students).
> 
> The testdrive cluster:
> 
> https://testdrive.loncapa.org
> 
> (not a part of the main LON-CAPA network) is currently running a
> 2.11.0 release candidate, if you have an opportunity to test that out.
> 
> 
> Thanks,
> 
> Stuart Raeburn
> LON-CAPA Academic Consortium
> 
> 
> Quoting Raymond Batchelor <batchelo at sfu.ca>:
> 
>> I am puzzled about the plagiarism check.
>> I previously had observed that at least some kind of check in
>> grading/viewing interface worked for multiply selected students in a
>>  course.
>> However, in the last couple of days, this is no longer working for
>> me.  I can ONLY get a check for the first student (alphbetically)
>> checked and NO others.
>> Also, it returns different results  for that one person.
>> 
>> I am beside myself trying to figure out what might have changed.
>> What could be interfering with the "% similarity" output?
>> 
>> Any ideas?
>> 
>> Thanks!
>> 
>> --
>> Ray
> 
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Doug

Douglas Mills
Director of Instructional Technologies
Department of Chemistry
University of Illinois
dmills at illinois.edu
(217) 244-5739 




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