When using Peergrade as a part of the evaluation of students, it is often meaningful to give more weights to specific parts of the course. There are four levels of weights that can be set in Peergrade:
- Weight between hand-in score and feedback score
- Assignment weights
- Section weights
- Question weights
By default everything the following weighting applies:
- Hand-ins are as important as feedback
- All assignments in a course are equally important
- Each question in an assignment is equally important
Combined Score Settings
It is possible to change the weighting between how much a students hand-ins count in comparison to their feedback when computing the total score. This can be specified in the Course Setting Interface in the section titled "Combined Score Settings". Click "Change weights" to change the weights.
To read about how the hand-in score and the feedback score is computed check out:
- The article about the hand-in score (coming soon)
- The article about the feedback score (coming soon)
Be default all assignments will have equal importance when computing scores in Peergrade. To change this go to the Course Setting Interface and look at the section titled "Assignment Weights".
If you specify that an assignment has a weight of 2, then that assignment will count twice as much as an assignment with weight 1 when computing a score. Likewise if you specify that an assignment has weight 0.25, then that assignment will only count a fourth of an assignment with a weight of 1.
Section Weights and Question Weights
By default all questions in an assignment will have equal weight. It is possible to assign weights to individual sections and questions when creating the evaluation rubric.
To assign a weight to a section, click "See advanced settings" when editing the section. Specify the weight for the section in the field "Section points". A weight of 1 is the default.
To assign a weight to a question, click "See advanced settings" when editing the question. Specify the weight for the question in the field "Question points". A weight of 1 is the default. It is only possible to assign weights to questions of the type Scale and Yes / No.
Example of how weights apply
To understand how weights work, we have created a small example here. Assume that you have a single assignment with 2 sections, that the first section has 3 questions and that the second section has 2 questions:
- Section 1 with Question 1, Question 2 and Question 3
- Section 2 with Question 4, Question 5
If there was no weights, the average score would be calculated as:
Total = (Q1 + Q2 + Q3 + Q4 + Q5) / 5
Now assume that Section 1 has a section weight of 2 and Section 2 has a section weight of 1:
- Section 1: Weight = 2
- Section 2: Weight = 1
Assume that the questions have weights:
- Question 1: Weight = 1
- Question 2: Weight = 2
- Question 3: Weight = 0.5
- Question 4: Weight = 1
- Question 5: Weight = 0.5
With these weights, the score for the two sections will be calculated as:
Section 1 total = S1 = (1 * Q1 + 2 * Q2 + 0.5 * Q3) / (1 + 2 + 0.5)
Section 2 total = S2 = (1 * Q4 + 0.5 * Q5) / (1 + 0.5)
and the total score would be
Total = (2 * S1 + 1 * S2) + (2 + 1)