[LON-CAPA-users] Plagiarism check in grading interface...
Stuart Raeburn
raeburn at msu.edu
Fri Aug 10 01:54:53 EDT 2012
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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