“Why do we need to analyze the items of

the test?”

Assessment- it is description, or explanation

of something, usually based on careful consideration or

investigation.

“Purpose of assessing the

item”To determine its difficulty.

How to Analyze the Item?

1. Facility index – the percentage of examinees who correctly answer an item. The higher

the index, the easier is the item.

Guide for interpreting the facility index:81-100% correct - very easy61- 80% correct- easy41- 60% correct- Average facility21- 40% correct- Difficult 0- 20% correct - Very difficult

2. Discrimination index – this is a number which indicates the ability of an item to differentiate between high and low scorers on the test

Guide for interpreting discrimination index:

Index≤ 0.0 - negatively or not at all

discriminating .01 - .15 - very low discrimination .16 - .30 - moderately discrimination .31 - .45 - good discrimination > .45 - highly discrimination

Sample of Difficulty Index

Option Freq. % Valid percen

t

Cum Perce

nt

*A 341 93.2 93.2 93.2

B 1 .3 .3 93.5

C 4 1.1 1.1 94.6

D 20 5.4 5.4 100

TOTAL 366 100 100

Item No. 1

Option Analyses

Option

Freq. %

*A 341 93.2

B 1 .3

C 4 1.1

D 20 5.4

TOTAL 366 100

Item No. 1

The correct key (A)was chosen by 93.2% of the examinees. This item is too easy; perhaps option A is very obviously the correct answer Option B is not performing as an option. It was not plausible enough. C is also a poor option. (To be considered plausible, an option must be chosen by at least 3% of the examinees)Item No. 2

Option

Freq. %

A 2 .5

B 340 92.3

*C 16 4.8

D 8 2.4

TOTAL 366 100

Item 2 suggests a possibly wrong key. Or it could imply misconceptions because B is just too attractive an answer. The key should be reviewed. The item too, because it might only have been misunderstood.

Item Analysis on 30 Item

N = 780

N= 780H = 27% OF 780 = 210B = 27% OF 780 = 210

Formula:FI = (h + b) X 100%

(H + B)

DI = (h - b) H

Distribution of Numbered Items Accdg. To Facility and Discrimination Indices

Facility Index(%)

DISCRIMINATION INDEX

Neg.-.00 .01 - .15 .16 - .30

.31 - .45 .46 - .60 > .61 Total

81 – 100%

61 – 80 %

4 2, 10 6, 13, 24 11, 14 8

41 – 60% 16 5 23, 17 29 1 3, 7, 20, 22

10

21 – 40% 25 26 15, 27 4

0 – 20% 9, 12, 17 8, 18, 21, 30

19 8

Total 5 6 4 5 4 6 30

The frequencies inside the green box are those of acceptable items.