Item Analysis Calculator
Introduction & Importance
Item analysis is a crucial process in test development and validation. It helps identify the quality and difficulty of test items…
How to Use This Calculator
- Enter the number of items (n).
- Enter the number of categories (k).
- Enter the proportion of items (p).
- Click ‘Calculate’.
Formula & Methodology
The formula for item analysis is complex and involves several statistical calculations…
Real-World Examples
Example 1
Consider a test with 50 items (n=50) and 4 categories (k=4). If 20% of the items are in category 1 (p=0.2)…
Data & Statistics
| Category | Proportion | Difficulty |
|---|---|---|
| 1 | 0.2 | 0.6 |
| 2 | 0.3 | 0.7 |
Expert Tips
- Always ensure your items are well-aligned with the test’s objectives.
- Regularly review and update your items to maintain test validity.
Interactive FAQ
What is item analysis?
Item analysis is a process in test development and validation…
For more information, see the ETS Standards for Psychometric Analysis.