Finals Part 2 - Evaluating Operational Definitions Flashcards
The same variables can have many definitions, how can we know which definition is best?
Concepts of Reliability and Validity
Reliability means…
Consistency and Dependability
If we apply variable in more than one experiment, they ought to work in similar ways each time.
Reliability
If possible, we select _________________ in measuring dependent variable because it is shown to be reliable.
Standardized test
Types of Reliability
Inter-rater reliability
Test-retest reliability
Inter-item reliability
The degree of agreement or consistency between 2 or more scorers regarding a measure
Inter-rater reliability
Also known as inter observer, inter coder, inter scorers
Inter-rater reliability
Reliability of measure by comparing scores of people who have been measured twice with the same instrument.
Test-retest reliability
Also known as time sampling reliability
Test-retest reliability
Different parts of a questionnaire, test, or other instruments designed to assess the same variable attain consistent results.
Inter-item reliability
Inter-item reliability can be assessed by:
Split half method
Cronbach’s Alpha
Principle of actually studying the variables intended to be manipulated or measured
Validity
The degree to which a manipulation or measurement technique is self evident
Face validity
Describes a judgement of how adequately a test samples representatives of the universe of behavior that the test was designed to sample.
Content Validity
Index of the degree to which a test scores predict some criterion measure
Predictive Validity