ITEM ANALYSIS
ITEM ANALYSIS
Facilitator: Marelen H. Amanuence
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.
1) Item Difficulty(Di)
The percentage of pupils who got the item right
2) Item Discriminating Power (Dp)
Indicates the difference between high and low achievers
Item analysis procedures for classroom test
1. Score the papers and rank them from highest to lowest.
2. Separate the top third and bottom third of the papers.
3. Tally the responses made to each test item by each individual in
the upper third group.
4. Tally the responses made to each test by individual in the lower
third group.
5. Count those in the upper group that got the item right and call it
U.
6. Count those in the lower group that got the item right and call it L.
Example of Item Analysis Result
Item
No.
Upper
Thirds
Lower
Thirds
1
18
15
2
10
6
3
5
1
4
10
1
5
6
14
Difficult y Index
Number of Students Tested – 60
Upper Thirds – 20
Middle Thirds – 20
Lower Thirds - 20
Interpre tation Discrimi Interpre nation tation
Index
Remar ks *Reject
**Retain
***Revise
For Item Difficulty (Di)
•7. Add U and L divided by the total of those who answered
in U and L and the result is the difficulty index of the item. where: R = the number of students who got the item right
T = the total number of students who tried the item
For Item Discriminating Power (Dp)
8. Subtract the L percentage from the U percentage and
the result is the discriminating index or the discriminating power (Dp) of the test item.
cont.
•Where:
= the number of students in the upper group who got the item right.
= the number of students in the lower group who got the item right.
= the sum of
Example of Item Analysis Result
Item
No.
Upper
Thirds
Lower
Thirds
Difficult y Index
Interpre tation Discrimi Interpre nation tation
Index
Remar ks *Reject
**Retain
***Revise
1
18
15
Facilitator: Marelen H. Amanuence
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.
1) Item Difficulty(Di)
The percentage of pupils who got the item right
2) Item Discriminating Power (Dp)
Indicates the difference between high and low achievers
Item analysis procedures for classroom test
1. Score the papers and rank them from highest to lowest.
2. Separate the top third and bottom third of the papers.
3. Tally the responses made to each test item by each individual in
the upper third group.
4. Tally the responses made to each test by individual in the lower
third group.
5. Count those in the upper group that got the item right and call it
U.
6. Count those in the lower group that got the item right and call it L.
Example of Item Analysis Result
Item
No.
Upper
Thirds
Lower
Thirds
1
18
15
2
10
6
3
5
1
4
10
1
5
6
14
Difficult y Index
Number of Students Tested – 60
Upper Thirds – 20
Middle Thirds – 20
Lower Thirds - 20
Interpre tation Discrimi Interpre nation tation
Index
Remar ks *Reject
**Retain
***Revise
For Item Difficulty (Di)
•7. Add U and L divided by the total of those who answered
in U and L and the result is the difficulty index of the item. where: R = the number of students who got the item right
T = the total number of students who tried the item
For Item Discriminating Power (Dp)
8. Subtract the L percentage from the U percentage and
the result is the discriminating index or the discriminating power (Dp) of the test item.
cont.
•Where:
= the number of students in the upper group who got the item right.
= the number of students in the lower group who got the item right.
= the sum of
Example of Item Analysis Result
Item
No.
Upper
Thirds
Lower
Thirds
Difficult y Index
Interpre tation Discrimi Interpre nation tation
Index
Remar ks *Reject
**Retain
***Revise
1
18
15