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RELIABILITY PURPOSE
 Measure of consistency
 Necessary but not sufficient condition for validity
 Measured using statistical index (correlation coefficient)

RELIABILITY DEFINITION
WHETHER A TEST OR MEASUREMENT TOOL MEASURES SOMETHING CONSISTENTLY

ERROR VARIANCE OF RELIABILITY:
STABILITY OVER TIME
Same Assessment, Multiple Occasions, Two administrations

ERROR VARIANCE OF RELIABILITY:
EQUIVALENCE OF FORMS
 Academic different versions of the same test,
 two administrations,

ERROR VARIANCE OF RELIABILITY:
SCORER CONSISTENCY
Openended items, Two administrations

ERROR VARIANCE OF RELIABILITY:
INTERNAL CONSISTENCY
ItemtoItem, SINGLE administration

TYPES OF RELIABILITY:
TESTRETEST
 Two adminstrations
 measures error due to time, length of time inĀ between tests
 focus on extent which scores can be generalized
 administer scale twice, calculate correlation coeffecient

TYPES OF RELIABILITY:
ALTERNATE/EQUIVALENT FORMS
 Two administrations to SAME group
 measures equivalence of two forms

