An hour after trying to work around various bugs in the awful 1.9 Moodle gradebook I found myself in need of this formula again, and the only place I could find it was in my own post on the old WebCT forums. I’m posting it here for my future reference only, but maybe it will be useful to other Bb Vista or Moodle users:

Drop the Lowest Score of a Series

For this example we need to know the labels (Bb/WebCT) or ids (Moodle) of the columns to be included. Here I use A1, A2, A3.

In this example we want to drop the lowest assignment score for our total, first in Blackboard Visa and then in Moodle:

This calculates the sum total of of the 3 assignments then subtracts the minimum score of the same series.

Drop the Lowest Two Scores of a Series

In this example we want to drop the lowest 2 assignment scores from our total. I’m using 5 assignments to illustrate this in practice.This can get pretty hairy, but once you’ve studied this example it should make sense:

This calculates the sum total of of the 5 assignments then subtracts the lowest possible combination of two scores found in the same series.

The aforementioned example will work for dropping lowest 3 and more using the same principles, but obviously it gets exponentially longer.