[LON-CAPA-users] Bubblesheet Grading: Use same CODE for a copy of a course folder?

[Stuart Raeburn]

Hi,

> I am not sure about the way how the CODEs and randomization are
> created.

When a CODE has been specified, the random seed to be used is  
generated from a digest of the CODE, the courseID, and the identifier  
for the unique resource instance (known as the 'symb').

Whenever bubblesheet grading is used to grade an assignment the CODE  
used during the grading pass is stored in the student's record for  
that assignment.  Subsequently, whenever that resource is rendered for  
that student (e.g., student viewing answers etc.), the CODE will be  
retrieved and used to re-generate the random seed for that particular  
instance of the resource.

If I understand correctly your description of the situation you are  
facing, a student taking exam 2 received a printed exam of (let's say)  
three pages, containing the following components:

Page  Origin of questions  CODE used in printout (and shown in header line)
1     Folder B             1345
2     Folder A             2262
3     Folder B             1345

where page 2 was a page that also occurred in exam 1, and the student  
bubbled in a single CODE for this exam -- 1345 -- i.e., the CODE shown  
on the first page of the exam.

> My idea:
> - Copy the course folder of the first exam

I don't see this working. The copied folder will contain different  
symbs, so the randomseed will be different for a given CODE, and the  
randomization could therefore be different from that which applied  
when page 2 was originally printed for exam 1 (but mistakenly included  
as page 2 of exam 2).

The solution I would adopt would be to:

1. Create two raw bubblesheet results files, by separating the student  
responses into those for included items from Folder A, and those from  
Folder B.  StudentIDs, names etc. will be duplicated in the two raw  
data files.

2. Upload the first of the derived raw data files to the course via  
the bubblesheet grading menu.

3. Hide the resources in Folder B, which were missing from the printed  
exam 2 students received.

4. Grade the Folder B exam using the first derived bubblesheet file,  
now containing only bubbles for the resources from Folder B, with the  
checkbox checked for "Skip hidden resources when grading".

5. Replace the CODE in each line of the other derived bubblesheet raw  
data file (i.e., change it from 1345 to 2262)

6. Upload the second derived bubblesheet file, containing only bubbles  
for the resources from Folder A, via the bubblesheet grading menu.

7. Hide the resources in Folder A, which did not appear in the printed  
exam 2 students received.

8. Grade the Folder A exam using the second derived bubblesheet file,  
now containing only bubbles for the resources from Folder A, with the  
checkbox checked for "Skip hidden resources when grading".

Note: to compute Exam 2 scores you will need to combine totals from  
both Folder A and Folder B.  This suggested approach also assumes that  
a given student was only assigned to either Exam 1 or Exam 2.

Stuart Raeburn
LON-CAPA Academic Consortium


Quoting Stefan Bisitz <st.bisitz at ostfalia.de>:

> Hi Bubblesheet graders,
>
> Your help is needed :-)
>
> We have two similar CODEd Exams, each with two different 4 digit
> numerical CODEs, all in one course, two folders. The PDF files have
> been printed. Bubblesheets have been filled in by the students
> corresponding to the questions in the PDF files. The sheets have been
> scanned and then uploaded to and graded in LON-CAPA.
>
> We unfortunately had a mistake in the chain of process of one of our
> Bubblesheet exams. It turned out that one part of the assignments for
> the second exam have been switched with the questions (and CODE) of the
> first exam! Hence, we stopped the validation check for the second exam
> and the grading has not been processed so far for any student.
>
> So, we have the answers for randomized questions we currently do not
> have. Is there any chance to create backwards a corresponding exam for
> these questions with the CODE of the first exam which were meant for
> the second exam? This would be okay in this case.
>
> My idea:
> - Copy the course folder of the first exam
> - Split the scanner results of the second exam by the two CODEs
> - One Bubblesheet grading for the scanner results with the correct CODE
> in the folder for the second exam
> - Another Bubblesheet grading for the scanner results with the
> "incorrect" CODE  in the new folder
>
> I am not sure about the way how the CODEs and randomization are
> created. Is it guaranteed that the copy of folder allows to use the
> same CODE as used for the original folder? We need to make sure that
> the randomization is fitting.
>
> Thanks for any help,
> Stefan Bisitz
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