Or is there some way to calculate a z-score intermediately on the basis of all the evaluation components and make Moodle use that?
What is z-score?
\(z=\frac{x-\bar{x}}{\sigma}\)
A measure of how many standard deviations away a student's score is from the mean score. A fairly reasonable grading structure could be:
| Grade | z-score intervals |
|---|---|
| A | 1.5 and above |
| B | [0.5,1.5) |
| C | [-0.5,0.5) |
| D | [-1.5,-0.5) |
| F | below -1.5 |
I didn't understand the formula but I understood your description. It sounds like a useful way of analysing results.
Its beyond useful. Its almost the most common way of doing relative grading in engineering schools (and others, I am sure)
So, how do I implement this on Moodle using existing tools?
Moodle's gradebook doesn't do that and in eleven years this is the first time I've heard this question raised in the forums.
Is there a way I could code this myself? Any docs to get started would be helpful.