Test Item Analysis Report
Calculate Difficulty (P) and Discrimination (D) Indices
Items Logged: 0
Midterm Exam - Algebra I
Instructor: Dr. A. Smith
Date: Oct 24, 2023
Sample Size (U+L): 0 Students
1. Executive Summary
Upper Group Size (N_U)
0
Lower Group Size (N_L)
0
Average Difficulty (P)
0.00
Average Discrimination (D)
0.00
**Interpretation Key:** Difficulty (P) is optimal between 0.30 and 0.70. Discrimination (D) should be above 0.30 (Good).
2. Item Quality Assessment
| Item # | $C_U$ | $C_L$ | Difficulty ($P$) | Discrimination ($D$) | Verdict |
|---|
Test & Sample Configuration
Sample Group Sizes (Top 27% & Bottom 27%)
These numbers define the reference groups for calculation. They should typically be the same size ($N_U = N_L$).
Item Data Entry
Enter the number of correct responses ($C_U$, $C_L$) for each item.