Review Psychometric Parameters of the 29th Residency Test (1380) According to the Classic Test Theory (CTT)

Introduction. To select the best group, and to make a good decision, are of the most important worries of the health and medical education ministry and also all entrants in the residency test. Having and performing a reliable and good exam will reduce doubts to a great deal. Considering different scientific methods consist of (precisely review of curriculum by the designer committee, sampling of the contents of lessons, assessment of the skill, item designing by specialists and considering the rules in qualitative item analysis) leads them to perform a reliable, valid and practical test. 1- To Study the psychometric parameters of the test item [reliability Parameters of the items (difficulty index, discrimination index and distract index)] 2- To study statistical characters of the test. Methods. This is a descriptive-applied study in which all entrants replied to the test. Information collection tool: A multiple choice (4 choices) test. Performance: The items of the tests were analyzed by analyzer software and the statistical and psychometric parameters were concluded. Results. KR20Reliability = 0.95, Mean P = 0.398” Standard error = 6.10, Mean RPBIS = 0.30” Total Test Variance = 762.55, Total Item Variance = 40.88” SD = 27.6 Conclusion. 1- Considering the amount of reliability and measurement standard error, this test (residency 1380), was precisely assessed. From another aspect the level and score of entrants were reliably calculated. 2-Due to lack of negative discrimination it is concluded that the item designing was proper. 3-The difficulty index of the items is some how proper with the number of resident selection. 4-To attain optimum results it is necessary to decrease the difficulty index more, it means that, difficulty index should be equal to the cut point test. For example: if you want to choose 1200 residents out of a 12000 group, it is recommended that a difficulty index of about 90% would be considered.