VI. Introduction to Item Analysis
a. Definition and objectives of item analysis
Item analysis is a systematic process used to evaluate the quality and effectiveness of individual questions or items in an assessment. Its main objectives are to assess question difficulty, determine the ability of questions to discriminate between high and low performers, and improve the overall quality of assessments. It involves evaluating individual assessment items to gauge their quality and effectiveness, specifically focusing on question difficulty and discriminatory power.
BASIC Information
READ
Understanding Item AnalysesREAD
Item analysis: An evaluation of multiple choice questions in Physiology examinationINTERMEDIATE Information
READ
Item analysis of multiple choice questions: A quality assurance test for an assessment toolREAD
Analysis of Multiple Choice Questions: Item Difficulty, Discrimination Index and Distractor EfficiencyADVANCED Information
Item analysis involves evaluating individual assessment items to gauge their quality and effectiveness.
Aims to assess question difficulty and discriminatory power.
READ
A primer on classical test theory and item response theory for assessments in medical educationQuestion Difficulty:
Determine how challenging a question is for students.
Identify questions that may be too easy or too difficult.
Discriminatory Power:
Evaluate a question's ability to distinguish between high and low performers.
Identify questions that effectively differentiate between strong and weak students.
Assessment Enhancement:
Improve assessment quality by refining or discarding ineffective questions.
Enhance overall assessment validity and reliability.
READ
Using item response theory to explore the psychometric properties of extended matching questions examination in undergraduate medical educationDifficulty Index:
Calculate the proportion of students who answered a question correctly.
Use the difficulty index to identify questions that were answered correctly by most students or only by a few.
Discrimination Index:
Compare the performance of high-scoring and low-scoring students on a question.
Determine if questions effectively discriminate between different levels of performance.
READ
Relevance and advantages of using the item response theoryPA Program:
Assessment: Pharmacology Multiple-Choice Exam
Item Analysis: Evaluating the difficulty and discriminatory power of questions related to drug interactions.
In Summary: Item analysis is a systematic process that evaluates individual assessment questions to determine their effectiveness and quality. By assessing question difficulty and discriminatory power, educators can enhance the overall quality of assessments and ensure that questions accurately measure student knowledge and skills. Advanced teachers can employ difficulty and discrimination indices to perform more in-depth analyses of question effectiveness.