Technical Report - International Military Testing Association

f
-.
‘Ibotertfaoul,X:-Cp I
.-
.
._.
.
(Formula 1)
Where: pi, or item p-values, la the
proportion of individuals
anawaring the item cor-
, ractly
The ‘teat � tan&rd deviation, s, - Critai (Foraul* 2)
The teat reliability, rm =
Uhere: rit8i la the point-biearial
item-teat correlation
multipled by the itar
etandord dsviatior~
‘1 ‘JPi (l-pi)
(Formula 3)
Where: I: lo the numbsr of iteqa in
tho toot,
� � 1 the itaa variance
si
‘I - Pi(l-Pi)*
tits1 la the point-biaorial
itaa-tect correlation
nultipliod by the itcap
standard devir tfon
In this ragcrd, ony itt-a action coding proceduroa that moues from
an ito analyaia should taka into account the end produce, or HOS tvaluation
Teat, which vould result, given the selection or revlaion of itwa
to k included in a rodevelopod teot.
In keeping vith a deaired toot mean of 62.5, all itrn p-valuoa � hould
������� � rouod .325. For a doaired teat atonderd deviation, I:- p-values
uhould also rango around a mdian value, I.o., a8 nmr .50 &I la practicable
la view of the dealred mean, rlnce al - pi( -pl) and lo at a maximum vhm
pi - .50.
Ap-?
The mlacted or acceptable items � o coded in the present procedure
with codes OK or M (mia1nslly acceptable). Itana to be rovlmed, Code
RV:, reach the HA level for item-teat correlations but either dirtractorteat
cotrelations or distractor proportions indicate they need minor
modification to be in consonance with tho � tatiatical characterlotica d
doaired in tt0S Eveluetion Teata.
, i I
. .
i
I