Lang

uage

Teac

hing

Eval

uation

Rel

iabi

lity

Fith

ri Y

enti

Has

ibua

n

May

uast

i

Syah

rela

Nia

ti

Reliability

Reliability refers to the consistency of a

measure

The more similar the score = the more reliable the test

interpretation

Scoring

administration

economy

Test Efficien

cy

Factors that effect language test score

Communicative language

ability

Test Score

Personal

Attributes

Test Method Facets

Randoms

factors

Classical True Score (CTS) measurement

theory

An observed score consists of a true score

and error score

Relationship between true and error scores

XeXt

X

Parallel Test

Both true scores are

equal

Two test are measures of the

same ability

Both error variances are equal

Reliability as the correlation between

parallel test

Equivalence

Stability

Internal

consistency

The Approaches to Estimating Reliability

Internal Consiste

ncy

The consistency of results across items on the same test. the two

questions are similar and designed to measure the same thing

Internal

consistence

Rater Consiste

ncy

Split-half estimate

Coefficient Alpha

GuttmanSpearman-Brown

Kuder-Richardson reliability

coefficients

Stability

The test-retest

approach

Stability of the test

scores over time

We administer the test twice to the same groups

of individual

Equivalence

Giving a test by using alternate forms of a test but have the

same meaning

The same difficulty level

and similar standard

deviations