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YANGZL金蟲 (小有名氣)
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[求助]
請問 mean value ≡ mean ≡ mathematical expectation 嗎? 已有2人參與
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請問 mean value ≡ mean ≡ mathematical expectation 嗎? 概率論與數(shù)理統(tǒng)計學(xué)里,英文 mean value 、 mean 、 mathematical expectation 完全可以互換嗎? 或者說,這3個詞,在含義上是否完全等價?就是常和方差 variance 一起出現(xiàn)的“均值/數(shù)學(xué)期望”。 即 mean value ≡ mean ≡ mathematical expectation ? 此外,average value 是什么意思? 我們的論文里同時出現(xiàn)“均值mean”和“平均誤差mean error”,審稿專家要我們解決這個confusing。具體該怎么處理? 平均誤差mean error,通常關(guān)聯(lián)均方根(root mean square)。 參考鏈接: [1] Mathematical expectation - Encyclopedia of Mathematics http://www.encyclopediaofmath.or ... matical_expectation |

專家顧問 (著名寫手)
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Mathematical expectation is used in probability. Mean value is used in statistics. The weight of the expectation is probability but mean value uses frequency or percentage as weight. They are different in theory and are not exchangeable. [ 發(fā)自手機(jī)版 http://www.gaoyang168.com/3g ] |

鐵桿木蟲 (正式寫手)
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In probability and statistics, mean and expected value are used synonymously to refer to one measure of the central tendency either of a probability distribution or of the random variable characterized by that distribution. --Wikipedia The expected value is also known as the expectation, mathematical expectation, EV, mean, or first moment. --Wikipedia 所以mean, mathematical expectation, expected value等是可以互換的,但在同一篇論文中應(yīng)該統(tǒng)一。而且我們控制科學(xué)在論文中“mean”用的比較普遍。 我們一般不說“mean value”表示均值,因為有 mean value theorem(中值定理/中間值定理/平均值定理)。 In mathematics and statistics, average would be called the arithmetic mean. -- Wikipedia “average”只是arithmetic mean,與mean有不同. “mean error”用法也許應(yīng)該要注意。有mean square error,有mean absolute error,但mean error我是找不到相關(guān)概念。誤差的平均?直接把誤差不經(jīng)過處理平均我覺得是“不科學(xué)”的。 |

專家顧問 (著名寫手)
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