Absolute vs Relative Grading

Grading is a concept that almost no two teachers agree upon. Some believe in including effort while others believe only performance should be considered. Some believe in many A’s while others believe A’s should be rare.

In this post, we will look at absolute and relative grading and how these two ideas can be applied in an academic setting.

Absolute Grading

Absolute grading involves the teacher pre-specifying the standards for performance. For example, a common absolute grading scale would be

A = 90-100
B = 80-89
C = 70-79
D = 60-69
F = 0-59

Whatever score the student earns is their grade.  There are no adjustments made to their grade. For example, if everyone gets a score between 90-100 everyone gets an “A” or if everyone gets below 59 everyone gets an “F.” The absolute nature of absolute grading makes it inflexible and constraining for unique situations.

Relative Grading

Relative grading allows for the teacher to interpret the results of an assessment and determine grades based on student performance. One example of this is grading “on the curve.” In this approach, the grades of an assessment are forced to fit a “bell curve” no matter what the distribution is. A hard grade to the curve would look as follows.

A = Top 10% of students
B = Next 25% of students
C = Middle 30% of students
D = Next 25% of students
F = Bottom 10% of students

As such, if the entire class had a score on an exam between 90-100% using relative grading would still create a distribution that is balanced. Whether this is fair or not is another discussion.

Some teachers will divide the class grades by quartiles with a spread from A-D. Others will use the highest grade achieved by an individual student as the A grade and mark other students based on the performance of the best student.

There are times when institutions would set the policy for relative grading. For example, in a graduate school, you may see the following grading scale.

A = top 60%
B = next 30%
C = next 10%
D, F = Should never happen

the philosophy behind this is that in graduate school all the students are excellent so the grades should be better. Earning a “C” is the same as earning an “F.” Earning a “D” or “F” often leads to removal from the program.

Grading Philosophy

There will never be agreement on how to grade. Coming from different backgrounds makes this challenging. For example, some cultures believe that the teacher should prepare the students for exams while others do not. Some cultures believe in self-assessment while others do not. Some cultures believe in a massive summative exam while others do not

In addition, many believe that grades are objective when there is little evidence to support this in academic research. A teacher who thinks students are low performers gives out such grades even if the students are high achievers.

As such, the most reasonable approach is for a school to discuss grading policies and lay out the school’s approach to grading to reduce confusion even if it does not reduce frustration.

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5 thoughts on “Absolute vs Relative Grading

  1. Roberto Guimaraes

    the teacher must be capable to evaluate the amount of knowlwdge necessary to the student go ahead in the course. With yhese knowledge the teacher can select the minimum minimorum that can be used as basis to generate all of them. Them, it is possible to do a test composed of two portions: the former is the minimum minimorum and the students wathing them received a grade enough to continue the course, the last portion is the maximum possible on which the students arre measured by the skill they shown, the questions are hard. But these are the beginning of evaluation. The teach must through the text fom the students, analyse his/her own teaching. How to do this? Noting the answer can detect: 1) how the students had be compreesion of the question, 2) the creativity in the answers, 3) the way to solve questions were similar to teacher or, by thre other side, had shown a seek in knowledge beyond the class and books, and so on. The discursive test are very useful for this purpose. In summary the evaluation of studys in order do assign a grade is an excelent way to promote the grow of the students.

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  2. Richard D. McCabe, PhD

    The problem I encountered in medical school with relative grading is that it was counterproductive to team work. Specifically, you benefit from the missed points of others. my introduction was a graduate student taking medical classes, after finish my notes I went to leave class only to see a medical student take someone’s notes and throw them in the trash. I put them back on the desk after he left. Then, in neuroanatomy lab, I shared a half brain with a medical student. After he learned each cranial nerve he would break it off so I would do worse (too bad, I did better). As a medical school professor, I’ve seen and heard of this several additional times. Also,in the four institutions I taught medical students at, the students would not help one another in the two that used relative grading and the the students freely helped each other in the two that used absolute grading. In my experience, relative grading encourages and rewards academic misconduct and discourages teamwork. In my opinion, relative grading has no place in an ethical institution of higher learning.

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    1. Dr. Darrin Post author

      Yes, this is a clear problem with relative grading. However, if you fix the proportion of letter grades the overall performance may go down but the distribution of letter grades will still be the same.

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  3. Duane Hampton

    In 33 years of college teaching in both engineering and geology at two different universities, I have always used relative grading. I call it the natural distribution of total points. I plot a graph with the total points vs the number of students with that point total. The top two grades are always A’s, and any grades within 3 or 4 points are also A’s. Point totals 10 points lower are B’s. 20 points lower are C’s. At my school, we also have intermediate grades such as BA, CB, and DC. The BA range is roughly 5–9 points lower than the top of the A range, unless the top A is clearly superlative and a curve buster. I look for natural gaps between the clusters of total point scores, to establish the boundaries for the grades.
    I read Dr. McCabe’s description of medical school where relative grading prompted unethical behavior. I have encountered cheating in my career, but apparently not as rampant as in his experience. I ask students to do projects and homework in teams which they suggest and I approve. My tests are open book, open notes, and are done individually. In my experience, the best students are usually willing to help other students.
    I feel that grading relatively is fairer than a 90-80-70-60 scale or any other absolute scale. My tests typically result in average scores varying from the 70’s to the 80’s. Some of my objective tests average in the low 70’s. The relative scale recognizes that tests vary, teachers vary, but the best students always do A work, which should be accepted as such, regardless of how low my tests average. Honestly, I consider my grades less subjective or subject to manipulation than those based on so-called objective scales.
    Dr. Duane

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    1. Dr. Darrin Post author

      Thank you for your comment. I guess another factor to consider is the degree being pursued. Maybe in medical school relative grading doesn’t work but it is appropriate in other areas.

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