I don't understand how edX calculates my score.
Your grade in edX may be made up of different types of activities, with different weights for each type. The course Syllabus will indicate how grading is structured. The following is an overview on how edX calculates your score.
- Each graded activity you complete calculates a percentage score for that activity (out of 100%) based on points earned divided by points possible for that one activity.
- The individual activity percentage scores of the same activity type (ex: quiz) are averaged together into an activity type average (ex: 10 quizzes get averaged together for an overall Quiz Avg). This activity type average has a defined weight in the course (ex: 20%).
- If there is more than one type of activity (ex: assignment), all individual activity percentage scores of that type are averaged together into a separate activity type average (ex: 5 assignments get averaged together for an overall Assignment Avg). That activity type average has its own weight (ex: 30%).
- Then edX combines the weighted activity type averages for all types into your Total score.
The Total score on edX is calculated as "what you earned so far, divided by the total amount possible in the entire course." This means your Total score will start out very low and increase as you complete more of the course. To have a more accurate understanding of how you are doing in the course, instead view individual grades for activities on the Progress page. You will want as many scores as possible over the "Pass" line.
How is partial credit calculated on a checkbox/multi-part problem?
Some courses use the "Every Decision Counts" method of partial credit for its multi-point problems (checkboxes, multiple dropdowns or fill-in-blanks). Basically, this means that for every item the learner does right – either checking a correct answer (choosing a correct answer) or leaving an incorrect answer unchecked (not checking a wrong answer) – the learner gets some value added to the total (based on the question's total point value). However, for every item the learner does wrong -- either checking an incorrect item (select a wrong option) or not selecting a correct item (not choosing a correct answer) -- the score is reduced by a certain value (again based on the question's total point value). This method scores learners more accurately on what they know or don't know, and is more forgiving to the learner than not allowing partial credit or using a "by halves" partial credit method (edX's other option for partial credit).