Comparison of validity of Bookmark and Angoff Standard Setting Methods in Medical performance tests
Abstract Introduction One of the main processes in evaluating of the students’ performance is standard staging to determine the passage for the test. The purpose of this study was to compare the validity of two methods of Angoff and bookmark in standard setting. Method Participants included 190 master’s students graduated in laboratory sciences since past year. Designed by a group of experts, a performance test with 32 item was used in this study to assess laboratory skills of graduates of medical laboratory sciences. Moreover, two groups of experts voluntarily participated in this study to set the cut-score. To assess the process validity, a 5-item questionnaire was asked from two groups of penists. To investigate the internal validity, the variance of the cut scores determined by the members of the two panels was compared with the F ratio. External validity was assessed by using four indices of correlation test with criterion score. Results Comparison of the two methods of Angoff and bookmarking showed that the mean of process validity indices was higher in bookmarking method. In order to assess internal validity, conclusion: Homogeneity of results and co-ordination of judges' scores were considered. Conclusion In evaluating of the external validity (concordance of the cut score with the criterion score), All five external validity indices supported the bookmark method.