Reliability And Validity Iv

Reliability & Validity - 4 of 5

By Ravi Kumar,
Think Assessments, Think RK!

Industry practices in assessment work flow


Industry practices in assessment work flow


“Reliability can be defined as
the degree of consistency
between two measures of the
same thing.”

Industry practices in assessment work flow 3


Kuder-Richardson Estimates

n   pq 
KR 20 rXX  1  
n 1  0 
2

n = number of items in the test
p = proportion of students who answered an item correctly
q = proportion of students who answered an item incorrectly



Cronbach’s Alpha

 n
2
n   i 
 1  i 1 2 
n 1  0 

 




 Test Length
 Speed

 Group homogeneity

 Difficulty of Items

 Objectivity



“Validity can be defined as the
degree of accuracy with which the
test measures whatever it
purports to measure i.e. to serve
the purpose for which it was
designed.”



 Content related validity

 Criterion related validity
(Predictive validity)

 Construct related validity



“Content Validity is a matter of determining
whether the sample is representative of the
larger universe it is supposed to represent.”

A test or exam can be built with high
content validity by:
◦ Identifying the subject matter topics and behavioral outcomes to
be measured.

◦ Building a Table of Specifications that specify the sample of items
to be used.

◦ Constructing a test that closely fits the specifications.



“ Criterion Validity involves
correlating between test scores
and scores in the course or
performance rating on the job.”



“Construct Related Validity is to be
established with scores correlated
to those who possess these traits
or constructs.”


Reliability And Validity Iv

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