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Variability is how spread out or closely clustered a set of data is.
Variability may refer to:
- Climate variability, changes in the components of Earth's climate system and their interactions
- Genetic variability, a measure of the tendency of individual genotypes in a population to vary from one another
- Heart rate variability, a physiological phenomenon where the time interval between heart beats varies
- Human variability, the range of possible values for any measurable characteristic, physical or mental, of human beings
- Spatial variability, when a quantity that is measured at different spatial locations exhibits values that differ across the locations
- Statistical variability, a measure of dispersion in statistics
- Variability function, a component of Bernoulli stochastics, a mathematical model
- Variability hypothesis, nineteenth century hypothesis that males have a greater range of ability than females
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