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  1. Sakai
  2. SAK-33537

GBNG Extra Credit with Weighted Category calculates incorrectly

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    Details

    • Type: Bug
    • Status: RESOLVED
    • Priority: Major
    • Resolution: Non-Issue
    • Affects Version/s: 11.3
    • Fix Version/s: None
    • Component/s: Gradebook
    • Environment:
      sakai.lampschools.org (Longsight)
    • Test Plan:
      Hide
      1. create a course
      2. add an instructor and two students
      3. add GBNG to the course, base the gb on points (points is the default setting, under Gradebook -> Settings -> Grade Entry.)
      4. in GBNG, create 3 categories, 1 "tests", 2 "everything else", 3 "extra credit".
      5. specify categories and weighting and modify the categories to be tests 50%, everything else 50% and extra credit 5%.
      6. create three manual gradebook entries, placing one into each category, making each worth 100 points. For the gradebook entry in the Extra Credit category, do not click extra credit on the item itself, as that would be extra credit within the extra credit category. Not needed and may affect calculation).
      7. provide perfect scores for each student in tests and everything else.
      8. provide a perfect score on the extra credit for just one student.

      In our test case the student who did the EC and did it perfectly got a 106.25%.

      Perhaps this is a regression? I tested this plan on nightly on Oct 30, 2017 @3:30pm EST and did not get the same result - but got the result I expected - no more than 105% is possible.

       

      Still it would be nice to know how this is calculated.

      Show
      create a course add an instructor and two students add GBNG to the course, base the gb on points (points is the default setting, under Gradebook -> Settings -> Grade Entry.) in GBNG, create 3 categories, 1 "tests", 2 "everything else", 3 "extra credit". specify categories and weighting and modify the categories to be tests 50%, everything else 50% and extra credit 5%. create three manual gradebook entries, placing one into each category, making each worth 100 points. For the gradebook entry in the Extra Credit category, do not click extra credit on the item itself, as that would be extra credit within the extra credit category. Not needed and may affect calculation). provide perfect scores for each student in tests and everything else. provide a perfect score on the extra credit for just one student. In our test case the student who did the EC and did it perfectly got a 106.25%. Perhaps this is a regression? I tested this plan on nightly on Oct 30, 2017 @3:30pm EST and did not get the same result - but got the result I expected - no more than 105% is possible.   Still it would be nice to know how this is calculated.

      Description

      How does an overall course grade in which Categories and Weighting is used with a category marked as extra credit get calculated?

      Please refer to this video:

      https://screencast-o-matic.com/watch/cb6vqe2n13

      It would seem based on this information: https://longsight.screenstepslive.com/s/sakai_help/m/59830/l/610229-how-does-extra-credit-work-in-gradebook at the very bottom in the section "Example: EC with weighted categories" that the most a student could improve their overall course grade is 5%.

      The expected behavior would be that two students earning a perfect grade in the course - both with 100% in the course could potentially increase their overall course grade to no more than 105%.  This is key, because setting the percentage of the EXTRA credit category helps define just how much of the extra credit category can improve a student's overall course grade. If for example a student scored a 60 toward the end of the course, yet decided to do the extra credit, they could possibly increase their course grade from a 60 to a 65.

      In this case however - the math  increases the student's score from 100% to 106.25% - by entering a perfect score for just one of the items in the extra credit category, recording a 10 out of 10 points possible.  Further, if an additional score is added to another item in the extra credit category less than 10, the student's score is reduced from 106.25 to 105.00 - by giving the student a 6.

      It's not clear how the extra-credit in a category marked extra credit - where the items in the category are NOT marked individually as extra credit - relying instead on the GB settings and the EC category - calculates a student's overall course grade.

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                • Assignee:
                  Unassigned
                  Reporter:
                  davideveland Dave Eveland
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                  • Created:
                    Updated:
                    Resolved:

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