316 Exam 3 Flashcards
Criteria of psychometric assessment (2)
Reliability
Validity
The CONSISTENCY and accuracy with which an instrument measures the attribute of interest
Reliability
3 aspects of reliability
Stability
Internal consistency
Equivalence
An evaluation of the quality of a measuring device
Psychometric assessment
The extent to which scores are similar on two separate administrations of an instrument
Stability
Test-retest Reliability is related to
Stability
The extent to which all items on an instrument measure the same unit
Internal consistency
How is internal consistency assessed?
Cronbach’s Alpha/coefficient alpha
In order to have legitimate internal consistency, the Cronbach Alpha must be
Greater than .70
Which of the 3 factors of reliability is most widely used?
Internal Consistency
The degree of similarity between alternative forms an instrument or similarities between observers
Equivalence
So when you hear the term interobserver/interrater reliability, think
Equivalence
Reliability is lower with
Homogeneous sample
Shorter multi-item instrument (less items)