PSY 233 Lecture 2: Psych- Lecture 2

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8 Feb 2017
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Tuesday, February 7, 2017
1
Chapter 1
Reliability
- In research, the term reliability means consistency or stability of a measure
If you measure the same thing many times, you should get the same results every
time
Thus psychological measures need to be consistent (stable)
- Types of reliability
Test-Retest
Inter-rather or inter-observer
Parallel forms
Internal consistency
- How well scale items covert with one another
Validity
- Validity is the quality of measuring what one is supposed to measure
- Types of validity:
Criterion
- Does a measure predict performance or success on some relevant criterion?
Content
- Does a measure (DV) provide a direct and representative "picture" of the variable
being studied?
Construct
- Does a measure assess the theoretical concept that it purports to measure?
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