Application of mean difference method in students' self-and peer-assessment / 中华医学教育探索杂志

ABSTRACT

Objective To explore an effective evaluation method for students' self-and peer-assess-ment. Methods The students of 6 groups participating in extracurricular teaching activities were selected as research subject. Traditional method (final score = mean score of group/2 + teacher's score/2) and mean difference method [final score=teacher's score-(mean difference of group-mean difference of all groups)] were used to calculate final score of each group, and effect of two methods were compared. Results Scores of most groups were higher than the teacher's scores, and high scores were given by group 3 in self- and peer-assessment. The final score of all groups were higher than teacher's scores in traditional method. Compared with teacher's scores, final scores increased significantly in group 1, 4, 5 below mean difference, final score decreased significantly in group 2, 3 above mean difference, and final score did not differ in group 6 equal to mean difference in mean difference method. Conclusion The mean difference method can reflect the effect of student's self- and peer-assessment, and guide student to make objective and accurate evaluation. It is a more reasonable and scientific evaluation method for self-and peer-assessment.