Classical Test Theory (Item Analysis)

Data Input

The input data includes variable names (header) in the first row.

Note: Input values (numeric or character) must be separated by tabs. Copy and paste from Excel/Numbers.

Response Data

i01	i02	i03	i04	i05	i06	i07	i08	i09	i10	i11	i12	i13	i14	i15	i16	i17	i18	i19	i20
A	B	B	B	B	C	B	C	B	D	D	C	A	B	A	D	B	D	A	C
C	D	A	D	C	B	D	B	D	A	D	D	A	B	C	C	C	A	D	C
B	D	C	D	A	B	A	C	B	D	B	A	A	D	D	A	B	C	B	B
C	C	D	D	D	A	A	D	D	D	A	B	C	B	D	B	C	B	C	A
A	A	A	D	A	A	D	B	A	C	A	D	C	C	C	C	A	A	A	B
A	A	B	C	C	A	A	A	A	A	B	C	C	C	C	B	D	C	D	D
A	A	B	A	A	A	D	B	C	C	B	C	D	A	B	D	B	B	B	D
A	C	A	D	C	A	D	A	A	A	D	D	C	C	B	A	D	C	A	D
D	B	A	D	D	A	D	B	B	A	B	B	B	C	A	A	D	A	C	B
C	C	A	C	B	C	D	C	A	A	D	D	A	A	B	C	B	B	C	C
D	A	C	B	D	A	D	B	D	A	A	D	D	C	A	C	D	C	A	D
A	D	A	D	C	A	A	A	C	D	B	B	B	A	A	C	C	D	C	C
D	C	B	A	D	A	D	B	B	A	B	D	C	C	C	C	D	A	B	C
D	C	C	D	A	A	D	B	D	B	D	D	C	B	B	B	D	B	C	B
D	C	A	D	D	A	D	B	D	A	A	C	C	C	B	C	B	A	A	B
B	C	B	C	B	B	D	D	A	A	B	A	C	D	D	B	A	A	B	C
D	A	A	A	D	D	B	C	B	A	B	A	D	B	D	C	C	D	D	C
C	D	B	C	C	A	D	C	C	B	C	A	C	A	A	C	C	B	A	C
D	B	A	C	D	B	D	B	D	C	D	D	A	C	A	D	C	D	D	D
A	C	A	D	B	C	C	D	D	C	A	B	C	C	A	D	B	C	A	B
D	C	A	D	B	A	D	A	A	A	A	D	C	C	C	C	B	B	D	D
B	A	B	B	B	A	D	D	D	D	D	D	B	B	B	D	B	D	C	C
B	C	C	A	C	C	D	B	D	A	C	D	D	A	A	A	C	B	D	C
A	C	A	A	A	B	D	B	A	A	C	C	C	C	A	B	A	B	B	B
D	D	D	B	C	A	D	B	C	A	D	D	B	D	B	C	B	A	B	A
A	D	A	B	A	A	B	C	B	B	A	A	B	A	C	A	D	B	D	B
B	D	D	A	C	B	D	D	A	A	B	D	C	A	A	D	D	A	D	D
D	C	D	B	A	A	B	C	C	B	C	D	C	C	B	D	A	B	C	B
D	B	D	B	D	A	D	C	D	D	C	D	C	D	D	B	C	C	B	D
B	B	D	C	D	A	B	B	B	B	B	C	A	C	C	A	B	A	B	A
D	C	C	C	C	A	D	A	B	A	C	D	C	C	B	A	A	C	B	B
B	A	A	B	D	A	A	D	D	A	A	C	D	A	D	A	A	C	B	A
B	A	A	B	B	C	B	A	C	A	A	C	D	D	B	D	A	B	B	B
D	A	C	B	B	A	C	B	B	D	B	D	C	A	A	A	C	D	D	D
B	C	B	A	D	A	D	B	A	A	D	B	C	A	C	B	A	B	C	C
A	A	C	B	A	A	C	B	B	C	D	A	B	C	A	D	A	B	B	D
D	C	A	C	A	A	D	B	C	B	A	D	C	B	D	C	D	D	C	A
D	C	C	B	A	A	D	B	C	B	D	D	B	A	D	A	D	C	D	D
B	C	B	C	A	A	D	B	A	A	A	C	D	B	D	C	B	D	C	C
D	C	A	B	D	A	D	A	B	B	C	C	C	A	A	A	C	C	A	C
C	C	D	C	B	D	A	C	D	A	C	B	A	D	D	A	B	D	A	C
C	D	B	D	A	A	C	B	C	A	B	D	C	D	C	A	D	C	B	A
C	D	C	B	B	A	D	B	D	A	D	D	C	B	D	B	B	A	A	B
B	B	A	B	B	A	D	B	C	C	D	B	C	C	D	A	D	C	D	C
D	B	D	C	C	A	D	D	B	A	C	A	C	C	A	B	C	C	A	A
D	A	D	A	A	A	D	B	D	B	B	B	A	B	B	C	C	B	B	A
D	C	A	D	D	A	D	B	D	A	B	D	C	C	B	A	D	A	B	B
D	C	A	D	B	A	D	B	D	A	A	D	C	C	B	B	D	A	C	B
D	C	D	A	B	A	D	B	D	D	A	D	C	D	B	C	D	A	A	B
A	B	A	B	A	A	D	B	A	C	C	B	C	D	B	D	C	A	D	A
B	B	A	B	C	A	D	A	B	A	C	D	C	C	C	B	B	A	D	D
D	C	C	D	D	A	D	B	D	A	C	D	C	D	D	A	B	B	A	C
D	C	D	D	D	A	D	C	B	A	A	D	C	D	B	D	D	C	B	A
A	B	A	D	C	A	B	B	C	C	C	B	D	A	A	A	B	B	C	D
B	C	A	C	A	A	D	A	B	C	D	A	C	B	C	B	C	C	B	C
C	A	B	D	C	A	D	A	A	D	C	B	A	A	B	B	B	A	C	D
A	D	A	B	C	B	D	B	B	C	B	A	C	C	A	A	A	C	C	D
B	A	A	B	D	A	D	C	D	A	A	D	C	C	D	A	D	A	A	B
D	C	A	B	C	A	D	D	A	A	D	A	C	B	C	B	A	A	A	C
A	B	D	C	C	A	D	A	D	A	D	D	C	C	A	B	C	B	B	D
D	C	A	D	D	A	D	B	C	A	A	D	A	C	B	C	D	A	D	B
B	A	A	C	C	C	D	B	B	C	A	A	A	D	B	B	D	D	D	C
D	C	A	B	B	A	D	A	B	B	A	D	C	C	A	C	D	B	A	B
D	C	A	B	C	A	D	B	A	A	A	D	C	C	B	C	C	A	D	B
C	B	A	C	C	A	B	A	A	D	B	A	C	A	A	A	A	B	C	B
C	C	D	A	D	C	B	B	A	B	C	D	C	B	C	C	D	A	A	A
B	A	B	A	B	A	A	A	C	C	C	B	D	D	B	B	B	B	A	A
D	C	A	D	D	A	D	B	D	A	A	D	C	C	B	B	D	B	A	B
D	C	A	D	D	A	D	B	D	A	A	D	C	C	B	C	D	A	A	B
D	C	A	D	D	A	D	B	D	A	A	D	C	C	B	B	D	A	A	B
A	C	B	A	D	A	A	B	B	B	A	D	C	B	B	A	D	D	A	D
A	C	A	B	C	B	D	B	C	D	A	D	C	C	A	D	D	D	B	A
D	A	A	A	A	A	D	B	B	B	A	A	A	C	B	C	D	D	A	B
A	C	C	D	B	A	C	D	A	A	A	A	C	C	B	A	D	C	B	B
D	C	A	D	D	A	D	A	A	D	D	D	C	C	C	D	A	A	A	B
D	C	D	B	D	A	C	A	C	A	A	D	C	C	D	D	C	C	B	D
D	C	A	D	A	A	D	B	A	B	A	D	D	C	B	B	D	D	D	C
B	C	A	B	C	A	D	B	A	D	A	D	C	C	A	C	B	B	A	B
D	C	B	D	B	A	D	C	D	A	B	D	C	C	B	C	D	D	A	B
D	C	A	D	D	A	D	B	D	A	C	D	C	C	D	A	D	A	B	D
D	C	A	B	D	A	D	B	D	B	A	D	C	C	B	D	A	B	A	D
C	C	A	C	D	A	D	B	D	B	A	D	A	C	D	C	C	D	A	B
B	C	A	D	C	B	B	D	B	A	B	A	D	C	D	C	A	D	D	B
C	A	D	A	A	A	B	C	A	C	B	C	C	D	B	B	C	C	D	B
B	B	A	C	A	A	D	B	C	C	D	A	B	A	C	D	D	B	C	A
D	C	A	D	D	A	D	B	D	A	A	D	C	C	B	D	D	A	A	C
C	C	A	B	C	A	D	B	D	D	A	D	A	C	D	A	C	C	B	B
A	C	B	D	D	A	D	B	A	A	A	D	C	C	D	C	A	B	A	D
D	C	A	D	D	A	D	B	D	A	A	D	C	C	B	A	D	A	A	B
D	C	A	D	D	A	D	B	B	D	A	D	A	C	C	C	D	A	C	B
D	B	A	B	D	A	A	C	C	D	C	C	B	D	C	C	B	B	D	B
D	A	D	B	A	A	A	C	B	A	C	A	C	D	B	C	B	C	D	D
B	D	A	B	B	A	C	D	C	B	B	D	D	A	B	A	B	D	C	C
D	A	B	B	C	A	D	B	C	A	A	D	C	C	B	C	D	C	D	B
A	A	B	B	D	A	A	D	B	A	B	D	C	C	D	B	B	A	B	D
D	C	A	D	D	A	D	B	B	C	B	D	A	A	C	B	D	A	D	B
D	C	C	D	D	A	D	B	C	A	A	D	C	C	B	B	D	D	B	B
D	C	A	D	B	A	D	B	A	A	A	D	C	C	B	B	D	A	A	B
B	B	A	C	D	A	D	B	C	A	D	B	C	C	D	C	D	C	B	D
D	A	A	D	D	A	D	B	B	A	A	D	B	C	C	C	D	A	A	B

Answer Keys (tab-separated)

Computing...

Checking the 1-0 Converted Data

Only the first 10 observations are displayed.

Basic Statistics

Cronbach's Coefficient Alpha

Item Analysis

Item_Mean: item facility (IF)
I-R_Correl: Item-Remainder score correlation ("corrected item-total correlation")
r_pbi: Point-biserial correlation ("item-total correlation")
U-L_DISC: item discrimination (upper 1/3 − lower 1/3)
AENO: actual equivalent number of options

Classical Test Theory (Item Analysis)

Data Input

Response Data

Answer Keys (tab-separated)

Checking the 1-0 Converted Data

Basic Statistics

Cronbach's Coefficient Alpha

Item Analysis

Distractor Analysis

Histogram of the Total Score

Box Plot with Individual Data Points

Test of Normality

Q-Q Plot