Operational Definition
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
An operational definition states precisely how a variable is measured, in terms another researcher could repeat.
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"Aggression" becomes "number of times a child strikes the inflatable doll in five minutes," counted by two independent raters.
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An operational definition never captures the whole concept. It captures enough of it to be checked.