Hello. Using Moodle 2.4.

I have some categories and subcategories set up in my Gradebook, and will be working with some new-to-Moodle instructors next week to work on translating how they want to grade their students into how Moodle works. To that end, I was reviewing the Category Aggregation section of Moodle Docs: http://docs.moodle.org/24/en/Category_aggregation

My question is whether it could be said that when the Docs say "Grade item," that you can insert "Category" in there as well. I think for something like the Weighted Mean, where you're giving each subcategory a weight it makes pretty good sense.

However, let's assume the situation is this:

The instructor would like to have a category for each type of activity, and then a subcategory in those "activity categories" for each week. So there's a "Progress Check" category, and then 5 subcategories for each week of the class. She then knows that these Progress Checks are 40% of the total grade -- each enough with weighted mean. And I think it's easy enough to use Weighted Mean to get an accurate mean of all of the Progress Checks from all weeks by explicitly stating the Weight, but it seems "Simple weighted mean" would be faster, and not require the instructor or course manager to explicitly state the weight for each week. What happens if you add or remove 1 progress check from 1 week? Then all of the weights for each subcategory would need changed.

So help me out -- Here's the description of "Simple weighted mean," which should solve this problem, from the Docs:

"The difference from Weighted mean is that weight is calculated as Maximum grade - Minimum grade for each item. 100 point assignment has weight 100, 10 point assignment has weight 10."

How does this translate to categories in the grade book? Is the "maximum grade" the "Category total"? Or is it somehow referring back to the max and min grades for each individual item?

I didn't find this question in the forums, near as I can tell...though I did find some very large, very complex threads, so I might have missed it.

EDITED TO ADD:

I should say that the whole "subcategory by week" thing isn't functionally important, but more based on visibility for the student. As the course goes on, they can visually separate one week from the next in the Gradebook. So the easiest solution to my problem is to get rid of the subcategories and put all of the Progress Checks into one category, use the Mean, and call it done. But let's assume I wasn't going to do that! Hahaha...