**Item analysis** is a technique which evaluates the effectiveness of items in tests. The two principal measures used in item analysis are **item difficulty** and **item discrimination**.

Topics:

- Basic Concepts
- Interpretation
- Real Statistics Functions
- Handling Partial Credit
- Real Statistics Data Analysis Tool

Dear Charles ,

what is the formula of Difficulty Level for test items ,because I am M.A student and I have to show the difficulty level of my test items.I have 60 items and I have to show the difficulty level of each item !

your cooperation is highly appreciated

bekhal /Iraq

Bekhal,

See the webpage http://www.real-statistics.com/reliability/item-analysis/item-analysis-basic-concepts/

Charles

How to know upper and lower group?

What to put in the upper and lower groups is up to you. You can pick any cutoff values you choose. Often it is the top 1/3 and the bottom 1/3.

Charles