What does the test mean if the difficulty index is 1?
answer was correct
“1” indicates the answer was correct; “0” indicates it was incorrect. Follow these steps to determine the Difficulty Index and the Discrimination Index.
What is Item discrimination?
Item discrimination refers to the ability of an item to differentiate among students on the basis of how well they know the material being tested. Various hand calculation procedures have traditionally been used to compare item responses to total test scores using high and low scoring groups of students.
What is distractor analysis?
Definition: The distractor point biserial correlation measures the reliability of each question’s answer choices. You would expect students who score well on the test to select the correct answer choice for each question.
What is a discrimination index?
The discrimination index (DI) measures how discriminating items in an exam are – i.e. how well an item can differentiate between good candidates and less able ones. For each item it is a measure based on the comparison of performance between stronger and weaker candidates in the exam as a whole.
What is a good difficulty index?
Results. The difficulty index of MCQ ranged from 0.67 to 0.79, which is considered as optimal level. The difficulty index for Long Case ranged from 0.89 to 0.91, which is considered as less optimal level.
What is Item difficulty level?
Definition. Item difficulty is an estimate of the skill level needed to pass an item. It is frequently measured by calculating the proportion of individuals passing an item.
What is maximum discrimination?
Maximum Discrimination: This is the sum of the percent in the upper and lower groups marking the item correctly. (If this sum is greater than 100, it is subtracted from 200.)
What is a test item?
Test Items A test item is a specific task test takers are asked to perform. Test items can assess one or more points or objectives, and the actual item itself may take on a different constellation depending on the context.
What is distractor efficiency?
A third metric used for the quality of BAQ is distractor efficiency (DE). Functional distractors per item (FDs/item) and DE in percentage are used to indicate how well the distractors performed their function of distracting the low-scorers.
What is implausible distractor?
An implausible Distractor can be defined as an answer choice that can be quickly. eliminated by someone with little or no knowledge of the topic being tested. For example, an answer choice could be considered implausible if it: ▪ is composed of relatively unimportant information along with other choices.
How do you calculate discrimination coefficient?
The Discrimination Index (D) is computed from equal-sized high and low scoring groups on the test. Subtract the number of successes by the low group on the item from the number of successes by the high group, and divide this difference by the size of a group. The range of this index is +1 to -1.
How do you interpret discrimination index?
The interpretation of High-Low Discrimination is similar to the interpretation of correlational indices: positive values indicate good discrimination, values near zero indicate that there is little discrimination, and negative discrimination indicates that the item is easier for low-scoring participants.
