covariance 中文意思是什麼

covariance 解釋
n. 名詞 【統計學】協方差，協變性；共離散。

  1. And then facing the problem of the channel estimation of the adaptive modulation system, we conclude out the channel estimation algorithms on maximum likelihood ( ml ) estimation and maximum a posteriori ( map ) estimation under the condition of flat fading channel and selective fading channel in detail. to meet flat fading channel, we simulate the relationship of the ratio between the error covariance in map estimation and ml estimation and pilot symbol message length. the conclusion can be drawn from these results

    接著，對自適應調制系統中的通道估計問題難點，詳細推導了平衰落通道條件下和選擇性衰落通道條件下最大似然（ ml ）估計和最大后驗概率（ map ）估計演算法，針對平衰落通道，我們模擬了map估計和ml估計的方差與導頻符號長度的關系，模擬結果表明，錯誤方差受多譜勒頻率的變化影響最大，並且對實際的自適應調制系統，導頻符號長度的取值超過20個符號長度時， map通道估計明顯優于ml通道估計。
  2. Application of covariance and correlativity coefficient to the designing of decision trees

    協方差及相關系數在決策樹構造中的應用
  3. The data on covariance presently available are here.

    目前所能獲得的關于協變的資料都在這兒。
  4. The additive genetic variance of the same character, estimated from the covariance of half sibs, was 0. 9602.

    從半同胞協方差估計出來的，同一性狀的加性遺傳方差為09602。
  5. The variable selection in covariance adjusted estimates

    協方差改進估計中的變量選擇
  6. Umvique of the covariance matrix in growth curve model

    增長曲線模型中協差陣的最優估計
  7. Fittings of systematic errors and covariance matrices in navigation

    精密定位的觀測值隨機模型
  8. Covariance and contravariance in delegates

    委託中的協變和逆變c
  9. Covariance and contravariance in delegates c programming guide

    委託中的協變和逆變（ c #編程指南）
  10. Portfolio frontier ; frontier portfolio ; q - zero - covariance portfolio frontier

    資產組合前沿資產前沿組合
  11. An algorithm of covariance analysis

    協方差分析的一種演算法
  12. The covariance should be comprehended and followed dialectically

    必須辯證地掌握和遵循圖書館學發展的協變性。
  13. Abstract : since the multiple failures situation is not uncommon in the clinical medicine, we explore the use of proportional odds model to the multivariate interval - censored data. the approach is based on the conditional logistic regression, which prevents the complications in the existence of nuisance parameters. the estimation of parameters is obtained by the newton - raphson algorithm. the sandwith estimator for the covariance is made according to the situation where there is correlation in the score statistic. simulations are also presented to assess the accuracy of the procedure

    文摘:探索比例優勢模型在臨床醫學中常見的多結局區間截斷數據中的應用.用條件的邏輯回歸方法避免討厭參數的估計，用牛頓-拉普森演算法估計回歸系數，用"夾心方差"估計量作為參數方差的估計.通過隨機模型檢驗模型應用的有效性
  14. Half - hourly measurements of co 2, water vapor, and energy exchange using the eddy covariance technique from walker branch watershed, tennessee, 1995 - 1998, http : cdiac. esd. ornl. gov ftp ameriflux data us - sites walker - branch

    對合成數據集和真實數據集的全面測試表明，本文提出的卸載策略的性能均好於現有其它方法。
  15. The theoretical foundation of the covariance is pertinence of system theory

    協變性的理論基礎是系統原理中的相關性。
  16. Based on the method expressing the positional uncertainty of point entities in surveying and mapping, uncertainty ellipse was employed to characterize the uncertainty region for the error dispersal of 2d target ' s position, and uncertainty ellipsoid for the 3d target. 1 - uncertainty ellipse was derived from positional error covariance

    借鑒測繪學科中衡量點元位置不確定性的方法，分別用橢圓和橢球來表示二維目標和三維目標的位置誤差散布的不確定性區域。
  17. Sta tis ti cal anal y ses included chi - square test, paired t - test, anal y sis of covariance, one - way anova, and scheffe s post hoc com par i son

    另外，經兩組前測為共變項之共變數分析之後，實驗組后測之自覺運動利益及運動自我效能分數皆顯著高於對照組后測之分數。
  18. By whitening the covariance matrix of flat ambiguity, correlation between ambiguity components, the number of local extrema of cost function is reduced. the search program getting into precocity is avoided by suitable encoding and genetic operation

    通過白化處理模糊度，減少模糊度搜索中指標函數的局部極值點，採用適當的編碼和遺傳操作使得在種群個體較少的情況下避免搜索陷入早熟。
  19. By using the optimized covariance matrices to optimize the new regularized discriminant analysis ( rda ), the correct classification rate is higher than that by the old rda

    利用優化的協方差矩陣對正則化判別分析方法進行優化，其模式分類正確率有顯著提高。
  20. The algorithms estimate the doa of the broadband distributed source fron the secondary diagonal elements of the covariance matrices generated from every frequency domain of the received broadband signals, thus avoiding unwrapping of phases

    該類演算法首先將陣列接收的寬帶信號變換到頻率域，然後對于每個頻率形成陣列接收信號協方差陣，最後由該協方差陣的次對角線元素估計寬帶分佈源的到達角，其主要特點是避免了相位展開。
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