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Rater reliability sometime refers to the consistency of scoring by two or more scorers.
Human error, subjectivity, and bias may enter into the scoring process. Inter-
rater unreliability occurs when two or more scorers yield inconsistent score of the
same test, possibly for lack of attention to scoring criteria, inexperience, or
inattention. Intra-rater unreliability is because of unclear scoring criteria, fatigue, and
bias toward particular “good” and “bad” students.
· Test Administration Reliability
Unreliability may result from the condition in which the test is administered. For
example is the test of aural comprehension with a tape recorder. When a tape recorder
played items, the students sitting next to windows could not hear the tape accurately
because of the street noise outside the building.
c. Test Reliability
If a test is too long, test-takers may become fatigued by the time they reach the later
items and hastily respond incorrectly.
d. Test and test administration reliability can be achieved by making sure that all
students received the same quality of input. Part of achieving test reliability
depends on the physical context-making sure, for example, that every students has
a cleanly photocopied test sheet, sound amplification is clearly audible to everyone
in the room, video input is equally visible to all, lightning, temperature, and other
classroom conditions are equal (and optimal) for all students.
Reliability refers to consistency and dependability. A same test delivered to a same
student across time administration must yield same results. Factors affecting reliability
are (Heaton, 1975: 155-156; Brown, 2004: 21-22):
1. student-related reliability: students personal factors such as motivation,
illness, anxiety can hinder from their ‘real’ performance,
2. rater reliability: either intra-rater or inter-rater leads to subjectivity, error,
bias during scoring tests,
3. test administration reliability: when the same test administered in
different occasion, it can result differently,