2011/03/30

Item Analysis

  1. How difficult is the test- difficult index
  2. How discriminating is the item- discriminating index
  3. How effective are the distracters- effectively
For Multiple Choice Only
  1. Among the score from highest to lowest- total no. of test papers
  2. Get upper 27%, lower 27%
Ex. 36 X 27%= 9 where 36 is the number of students

Actual:  52 items X 27%= 14.04
Lower Group(LG)= 9

Difficulty Index= RH + RL/30

HG=15
LG=15
Total= 30

RH= Number of right answer HG
RL= Number of right answer LG

Example:

Items
RH
RL
Index of Diffulty
Descriptive Level
Recommendation
1
13
6
.63
Moderately difficult
Very Acceptable
2
12
1
.07
Very Difficult
Discard


Difficulty Index


Index of Difficulty
Descriptive Level
Recommendation
0.91-above
Very easy
Discard, revise, not acceptable
0.76-0.90
Easy
Limited acceptability
0.26- 0.75
Moderately difficult
Very acceptable
0.11- 0.25
difficult
Limited acceptability
Less 0.11
Very difficult
Discard, revise

Discriminating Index
Index of Discrimination
Descriptive Level
Recommendation
0.41- above
High
Very acceptable
0.20- 0.40
Moderate
Acceptable
0-0.19
Low
Limited acceptbility
negative
Poor item
Discard

Example:
Items
RH
RL
Discriminating Index
Descriptive level
Recommendation
1
13
6
0.46
High
Very acceptable
2
3
6
-0.6
Poor Item
Not acceptable discard
3
10
4
0.4
Low
Limited acceptability

Discriminating Index= (RH-RL)/ 0.5N
                                = (13-6)/15= 0.46
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