Understanding accumulative grading

Understanding accumulative grading

by Jared Chapman -
Number of replies: 2
I have been using the latest version of workshop and accumulative grading does not seem to be computing the results correctly.
 
Notice that in the following screen shots that it adds the two whole numbers but comes out with a grade that is a decimal that is sometimes higher and sometimes lower than the actual score. The last screenshot is the setup screen for the assessment. Am I doing something wrong or is this a bug?
 
1+3=3.75
1+4=4.58
2+3=5.00
2+4=5.83
2+5=6.67
2+6=7.50
3+4=7.08
3+5=7.92
3+6=8.75
4+4=8.33
4+5=9.17
4+6=10.00
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In reply to Jared Chapman

Re: Understanding accumulative grading

by Jared Chapman -

This is not a bug. As it has been described in the docs as well as answered in forums, it's important to realize that in the Accumulative strategy, the actual maximum grade for each aspect does not influence its weight. So both aspects in your setup have the same weight (as both have it set to "1"). The final grade is calculated as an arithmetic mean of them.

For example in the first assessment, given grades for aspect 1 and aspect 2 are 4/4 and 5/6, respectively. The total grade is then calculated as (4/4 + 5/6)/2 = 0.91666 which is then correctly displayed as 9.17 of 10.00.

If you expected it being counted as (4 + 5)/(4 + 6) then you need to use the Rubric strategy (displayed in the grid or list layout of your choice).

See http://docs.moodle.org/25/en/Workshop_grading_strategies for more details.

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In reply to Jared Chapman

Re: Understanding accumulative grading

by Jared Chapman -

I see, thanks for the clarification.

So, if I change my weights to 4 and 6 respectively, I'll get the desired results?

I tried this and then hit the re-grade assessments button but the scores did not change. Is it too late to save these assessments?

I am using this format because I prefer how it looks, it is nice an  clean, and I have done a lot of assignments this way and would prefer not to go back and change them all.

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