**Item Points Earned Points Possible Percentage**

**Category Total**

**112 135 83%**

**Item Points Earned Points Possible Percentage**

**Category Total**

**104 120 87%**

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I have a question specific to my settings, so I did not think the general forum was the place to post my question. We are running 2.8.

I have historically use the Natural method of aggregation. If I am understanding this correctly, the natural method would add up assignments like this:

Homework 1 10 10 100%

Homework 2 10 10 100%

Homework 3 8 15 53%

Homework 4 84 100 84%

I really don't understand the help page explanations of grade calculations and with 2.8 there are some new aggregation types that have little explanation. I want to sum the grades as you see here, but I want to drop the lowest. With the "Natural" aggregation I cannot do that. How can I accomplish this result:

Homework 1 10 10 100%

Homework 2 10 10 100%

Homework 3 8 15 53% **DROPPED**

Homework 4 84 100 84%

Thank you and I appreciate any advice on this one!!

Hi Jason,

Drop Lowest didn't work properly with sum of grades (it would always take the lowest points earned, not the lowest percentage), so when we wrote specifications for Drop the Lowest with Natural Weighting, we required all items in a category to have the same value (points for natural, or percentage for adjusted weighting). In your scenario above, you'd have to adjust the four assignments so they were weighted equally at 25%.

Mark

Do any of the later releases of moodle look at the *percents* as a rule to drop the lowest? If not, maybe something to consider...?

Thanks Mark for the feedback.

I would agree with that - if it just looked at percentages, then it would work as we would want it to.

Your example above illustrates why this was done this way; one of your items is worth 10 times two of the other items. If the effort on the assignments is equal, then adjusting the weight to 25% each shouldn't be an issue.

I see your point Mark. I wish the grades were all equal effort. Some are two or three question homework assignments (worth less weight) and some are week long homework assignments that deserve a heavier weight. So I guess the best way to describe what is happening is that not all grades have the same weight, and I am trying to drop the grade with the lowest percentage. For example, a 5 question HW might be worth 10 points, but a 50 question HW is worth 100 points.

If your items are not the same weight, it's not fair to drop the lowest percentage, and it encourages your students to put more effort into the lower weighted assignments. For example:

*Student A*

9/10

10/10

6/10

**59/100**

Drop the 4th assignment, grade is 25/30 (83.33%)

*Student B*

9/10

10/10

**6/10**

61/100

Drop the 3rd assignment, grade is 80/120 (66.7%)

There's a 2-letter grade difference between these two students, but only a 2% difference on one item.

If you normalize this so each assignment is weighted at 25%, you end up with:

*Student A*

9/10

10/10

6/10

**5.9/10**

Drop the 4th assignment, grade is 25/30 (83.33%)

*Student B*

9/10

10/10

**6/10**

6.1/10

Drop the 3rd assignment, grade is 25.1/30 (83.67%)

9/10

10/10

6/10

Drop the 4th assignment, grade is 25/30 (83.33%)

9/10

10/10

61/100

Drop the 3rd assignment, grade is 80/120 (66.7%)

There's a 2-letter grade difference between these two students, but only a 2% difference on one item.

If you normalize this so each assignment is weighted at 25%, you end up with:

9/10

10/10

6/10

Drop the 4th assignment, grade is 25/30 (83.33%)

9/10

10/10

6.1/10

Drop the 3rd assignment, grade is 25.1/30 (83.67%)

Shouldn't that be up to the teacher to decide?

Yes.. I see your point Mark. Definitely. My High School students have never caught onto that bit of info, so please don't share it with them! ;)

I am going to move ahead using the simple weighted mean of grades a dropping the lowest and see how that affects things.

Thanks!