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Pooled variance

In statistics, pooled variance (also known as combined variance, composite variance, or overall variance, and written σ 2 {\displaystyle \sigma ^{2}} ) is a method for estimating variance of several different populations when the mean of each population may be different, but one may assume that the variance of each population is the same. The numerical…

Standards, Definition and computation & Aggregation of standard deviation data

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Definition and computation

Sample variancesSample sizesArithmetic meanWeighted averageDegrees of freedom
8 related topics

Aggregation of standard deviation data

Covariance
1 related topics

Example

Standard deviationRandom errorMean
3 related topics

Motivation

Independent variableTest
2 related topics

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Motivation

Definition and computation

Example

Aggregation of standard deviation data

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Map overview Semantic statistics

Pooled variance

Nodes27
Edges26
Triples9
Avg. degree1.93
Density0.074074
Components1

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Pooled variance

Top relations

related to Motivation · 4
Pooled variance → For, If, In, Reasonable
related to Definition and computation · 2
Pooled variance → The, We
related to Effect on precision · 2
Pooled variance → Pooled, The
is a · 1
Pooled variance → estimate of the fixed common variance σ 2

Important terminology Word statistics

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Important terminology

variance pooled mean standard deviation data also estimate displaystyle populations sigma statistics precision known population sets may one sample overall

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Pooled varianceis aestimate of the fixed common variance σ 20.90text
Pooled variancerelated to Definition and computationThe0.60section
Pooled variancerelated to Definition and computationWe0.60section
Pooled variancerelated to Effect on precisionPooled0.60section
Pooled variancerelated to Effect on precisionThe0.60section
Pooled variancerelated to MotivationIn0.60section
Pooled variancerelated to MotivationFor0.60section
Pooled variancerelated to MotivationIf0.60section
Pooled variancerelated to MotivationReasonable0.60section

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