A Simple Method to Reduce Systematic Bias in Grades

Grades in universities may suffer inflation over time. Moreover, the grade-average of some classes is much lower or higher than would be expected from the students attending the class. Here is a simple (and imperfect) method to avoid these:

First, one needs to decide on the average grade v. The gpa of any student who hasn't completed any classes yet is set to v. To find the grades of students in a class, the average c of the gpas of the students is computed, and then their final grades in the class are curved so that the average grade for that class becomes c.

A somewhat orthogonal approach would be to take into account previous raw grades for the same class and teacher.

Additionally, one could try to normalize variance as well.