Variables, etc
- Page ID
- 13571
Variables
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Defining, Measuring, & Manipulating
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IVs
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DVs
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Levels?
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Confounding variables
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Reliability
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Validity
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Operational definition of a variable
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A definition of a variable in terms of operations/activities that a research uses to measure/manipulate it
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Gives a variable a concrete definition so you can actually use it in an experiment, this allows the researcher to maintain consistency.
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All variables involved in a study should be operationalized
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Dependent Variables (what is measured)
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Independent Variables (what is manipulated)
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Levels of Measurement
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Identity
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Measurement in which different objects receive different scores
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Magnitude / ordinality
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Measurement in which the ordering of numbers reflects the ordering of variables
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Equal Unit Size
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A difference of 1 is the same amount throughout the entire scale
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EX “the height difference between two people who are 64 inches tall and 65 inches tall is the same difference between those who are 72 inches tall and 73 inches tall”
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Absolute Zero
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Assigning a score of zero indicates an absence of the variable being measured
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Scales of Measurement
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Nominal
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Ordinal
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Interval
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Ratio
Discrete Variables
Continuous Variables
Types of Measures
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Self-report
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Tests
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Behavioral
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Physical
Reliability
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Types of Reliability
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test/retest
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Alternate-forms
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Split-half
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Interrater
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How to Measure Reliability
Validity
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Content
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Criterion
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Construct