reliability (assessment of student learning i)

RELIABILITY

What is Reliability?

Reliability refers to the consistency of a measure. A test is considered reliable when we get the same result repeatedly. It is impossible to calculate reliability exactly, but it can be estimated in a number of a different ways.

Errors of measurement

Test-Takers- this sources of errors takes place into consideration what is happening within the individual like fatigue, hunger, headache, emotional upset and anxiety growth.

Test- Administration- it can be cause by lighting of examination room, room temperature, noise, sitting arrangement, instruction, attitude of test examiner.

Expert agree that the longer the test the higher is its reliability.

Test- Scoring- factors that contribute to error in scoring include miskey, wrong answer to test items, mistake in correcting answer, mistake in the use of correcting pencil and subjective scoring.

Test Itself- the difficulty of the test, may contain poorly constructed items that gives clues, ambiguous items, very easy items and very difficult.

Different Methods Of Reliability

Test-Retest Reliability- the test is administered twice at two different points in time. It is best use for things that are stable over time.

Inter-rater Reliability- assess by having two or more independent judges score the test. The score has been compared to determine the consistency of the raters estimate.

Parallel Forms Reliability- gauged by comparing two different test that were created using the same content.

Internal Consistency Reliability- use to judge the consistency of results across items on the same test. When we see a question that seems very similar to another test question. It may indicate that two questions are being use the gauged reliabity.

Split-half- give parallel form of test with in crease time interval between forms using Pearson R formula.

Kuder Richardson- give the test once then correlate the proportion and percentage of the student passing and not passing a given items with the measure of internal consistency.

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