If the random variable is x , the mean of x is μ, and the positive variance is σ2 , then for any positive number ε, the probability that | x - μ | ≧ ε is not greater than σ2 / ε2 . In other words, expressed as a formula using probability symbols, it is Pr(| x - μ | ≧ ε) ≦ σ2 / ε2 . This formula is called Chebyshev's inequality. In functional analysis, it expresses the relationship between mean convergence and measure convergence. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
確率変数を x ,x の平均値を μ ,正の分散を σ2 とするとき,任意の正の数 ε に対して |x-μ|≧ε となる確率は σ2/ε2 より大きくない。すなわち確率の記号を使って式に表わせば Pr(|x-μ|≧ε)≦σ2/ε2 である。この式をチェビシェフの不等式という。関数解析的にいえば,平均収束と測度収束の関係を表わしている。
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>>: Chebyshev, Pafnutii L'vovich
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