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Item Difficulty And Item Discrimination Pdf

item difficulty and item discrimination pdf

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Published: 05.05.2021

Metrics details. Failure to adhere to standard item-writing guidelines may render examination questions easier or more difficult than intended.

Understanding Item Analyses

The Item Analysis output consists of four parts: A summary of test statistics, a test frequency distribution, an item quintile table, and item statistics. This analysis can be processed for an entire class. If it is of interest to compare the item analysis for different test forms, then the analysis can be processed by test form. The Division of Measurement and Evaluation staff is available to help instructors interpret their item analysis data. Part II of the Item Analysis program displays a test frequency distribution. The raw scores are ordered from high to low with corresponding statistics:. See sample Test Frequency Distribution download pdf.

Professional Testing, Inc

To browse Academia. Skip to main content. By using our site, you agree to our collection of information through the use of cookies. To learn more, view our Privacy Policy. Log In Sign Up. Download Free PDF. Item Difficulty and Item Discrimination.

Item analysis is a process which examines student responses to individual test items questions in order to assess the quality of those items and of the test as a whole. Item analysis is especially valuable in improving items which will be used again in later tests, but it can also be used to eliminate ambiguous or misleading items in a single test administration. This report has two parts. The first part assesses the items which made up the exam. The second part shows statistics summarizing the performance of the test as a whole.

item difficulty and item discrimination pdf

So item difficulty helps us to know the degree to which students get answers correct, whereas item discrimination examines how the top-scoring group of test.


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Item Difficulty and Item Discrimination

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Grounded in the real world of public schools and students, this engaging, insightful, and highly readable text introduces the inner-workings of K—12 educational assessment. There has never been a time when it is more important for educators to have an understanding of testing and assessments. Accountability is now a fact of life for all public school educators, and testing is at the core of all educational assessment programs. It is no longer prudent or even possible for educators to ignore this national zeitgeist. Educational Assessment: Tests and Measurements in the Age of Accountability addresses all of the constructs central to understanding the design, construction and evaluation of educational measures. It addresses the problem of understanding and correctly interpreting test scores on local, statewide, national, and international assessments.

Download this information in PDF format. The item analysis is an important phase in the development of an exam program. In this phase statistical methods are used to identify any test items that are not working well. If an item is too easy, too difficult, failing to show a difference between skilled and unskilled examinees, or even scored incorrectly, an item analysis will reveal it. The two most common statistics reported in an item analysis are the item difficulty, which is a measure of the proportion of examinees who responded to an item correctly, and the item discrimination, which is a measure of how well the item discriminates between examinees who are knowledgeable in the content area and those who are not.


Item analysis is useful in helping test designers Item difficulty index= The proportion of test takers Item discrimination= How well an item can discriminate​.


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