  When the college student satisfaction survey is considered in the promotion
and recognition of instructors, a usual complaint is related to the impact that
biased ratings have on the arithmetic mean (used as a measure of teaching
effectiveness). This is especially significant when the number of students
responding to the survey is small. In this work a new methodology, considering
student to student perceptions, is presented. Two different estimators of
student rating credibility, based on centrality properties of the student
social network, are proposed. This method is established on the idea that in
the case of on-site higher education, students often know which others are
competent in rating the teaching and learning process.
