Variable (Statistics)

Updated 17 Sep 2026

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What it is
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  a characteristic that can take different values across observational units or conditions
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Roles in research
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  independent variable/predictor — an input, explanatory factor, or manipulated condition
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  dependent variable/outcome — the response being measured
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  controlled variable — a condition deliberately held fixed
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  confounder — a factor that can distort the apparent relationship between variables
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Types
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  Discrete Variable
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  Continuous Variable
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Example
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  feature set and noise level as predictors; F1-score as outcome; hardware configuration held fixed
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Caution
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  calling a variable "independent" does not establish a causal effect
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Related

Linked references 6