Any one knows about the Degrees of freedom in a Statistical Concept.

Hi! Please help me I am stuck with this.
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"In statistics, the number of degrees of freedom is the number of values in the final calculation of a statistic that are free to vary. Mathematically, degrees of freedom is the dimension of the domain of a random vector, or essentially the number of 'free' components: how many components need to be known before the vector is fully determined.. In equations, the typical symbol for degrees of freedom is (lowercase Greek letter nu). In text and tables, the abbreviation ""d.f."" is commonly used. Source:"
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In statistics, the number of diplomas o which can be free to change.
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