lesson 5 Flashcards
refers to the accuracy and precision of the tool
reliability
The scores are obtained when the ‘instrument is used with samples on separate occasions’
stability of the instrument
The one that can be repeated over and over (at different times)
stable research instrument
It can only be done when you assume that ‘the trait being measured will remain constant over time’
Major limitation
Example of stable concept
Intelligence
Example of unstable concept
Pain
The repeated measurements over time using the same instrument on the same subject
Test-Retest
This type of stability is used in interviews, examination, and questionnaires
Test-Retest
This method has the same basic elements as test/retest
Repeated Observations
The instrument shows that “all indicators or subparts measure” the same characteristics or attributes of the variables
Internal Consistency
What are the test of stability
Test-Retest
Repeated Observations
Scores on one half of a subject’s responses are compared to scored on the other half
Split half correlation
A measure of internal consistency, that is “how closely RELATED A SET OF ITEMS are as a group”
Cronbachs Alpha Coefficient
Types of Internal Consistency
Split half correlation
Cronbachs Alpha Coefficient
Primarily concerns the degree to which “two or more independent observers or coders agree about scoring”
Equivalence
