方差性 的英文怎麼說

中文拼音 [fāngchāxìng]
方差性 英文
scedasticity
  • 方 : Ⅰ名詞1 （方形; 方體） square 2 [數學] （乘方） involution; power 3 （方向） direction 4 （方面） ...
  • 差 : 差Ⅰ名詞1 （不相同; 不相合） difference; dissimilarity 2 （差錯） mistake 3 [數學] （差數） differ...
  • 性 : Ⅰ名詞1 （性格） nature; character; disposition 2 （性能; 性質） property; quality 3 （性別） sex ...
  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. Only the additive genetic variance is transmissible by seed.

    僅僅加性遺傳方差是由種子遺傳的。
  3. Quadratic estimates of variance components and admissibility

    方差分量二次型估計及容許性
  4. Cathode and anticathode electric current distributing online detect equipment can trace aluminum electrolysis pot and document the electric current data change. by avail of this data, the relation of anticathode and cathode will be discovered. furthermore, some unknown rule may de discovered by online analysis and data mining. in this paper, author has completed a full study toward the production of aluminum electrolysis

    陰、陽極電流分佈在線檢測裝置跟蹤記錄了大量的鋁電解槽在平穩運行和發生針振時的陰、陽極電流分佈變化情況及方差變化情況的原始數據；從理論上講，在這兩者之間存在一定的對應關系，通過對陰、陽極電流分佈的實時、在線檢測，可以對電解槽的穩定性進行判斷，從而找到一種全新和更有效的管理模式。
  5. The article analyses whether the theory of emh market can explain some phenomena on capital market. we provide some evidence for the non - normal, non - gaussian distribution, auto - correlation, non - linear and heteroskedasticity character of stock price

    文章就有效市場假說（ emh ）對現實資本市場的解釋能力進行了分析，發現我國股票市場的股價收益率序列具有非正態性、自相關性、非線性、異方差性等特點。
  6. The sixth chapter " essay on the estimation of stock price model " briefly introduced evolution of chinese stock market, showed the abrupt change and discontinuity of chinese stock market return, estimated the three models on the shanghai security exchange comprehensive index, compared the result made by the three models ? the result showed that the figarch model is better in modelling the autocorrelation, heteroskedasticity and nonlinear characteristics of stock price than the others

    建立了上證指數的arfima ， garchzjifigarchta刑種杖刑，並對模二解冰股票價格波動的囪相關性，異方差性和非線性市場的效果以及對價格的問歸和預測效果作了比較，得出結論n a ch模型在解決這些問題上效果最好，二種模刑在價格問歸和預測值上都存在一階滯后問題。
  7. ( 2 ) when analyzing the testing method for the " day - of - week effect ", we considered the ols regression effect and the testing power will decrease because of the different variable in real securities data. we considered the identification. estimation and hypothesis testing of the linear regression model with one rank auto - regression ( ar ( 1 ) ) error ( 3 ) we considered how investors reasonably utilize the testing result of the " day - of - week effect " to direct the investment strategies after obtained it

    （ 2 ）在對「周內效應」的檢驗方法進行分析時，考慮到實際證券數據由於具有異方差性，使得利用ols進行回歸將導致回歸效果和檢驗的勢降低，我們對于具有一階自回歸誤差的線性回歸模型，仔細討論了該模型的識別、估計和對相應參數假設檢驗的方法。
  8. One of the important hypotheses of classical linear regression model is that the random disturbances have equal variance

    經典線性回歸模型的一個重要假設就是回歸方程的隨機擾動項u _ i ，具有相同的方差，也稱同方差性。
  9. If the assumption fails, we say the model exhibits heteroskedasticity

    如果這個假定不成立，我們說模型存在異方差性。
  10. " for methods of analyzing economic time series with time - varying volatility arch

    所發明的「自動遞減條件下的異方差性」
  11. The model which has such kind of property is referred to as heteroscedastic regression model

    擾動項具有異方差性的模型稱為異方差模型。
  12. However in most economic phenomena, this kind of hypothesis is not necessary true. sometimes the disturbances vary with the observations. this is called heteroscedasticity

    但在大多數經濟現象中，這種假設不一定成立，有時擾動項u _ i的方差隨觀察值的不同而變化，這就是異方差性。
  13. If it is estimated by the method of ols, it will bring about serious effect : the variances of the parameter estimators are not the least, and the accuracy of estimation and prediction decreases

    如果對異方差模型進行ols估計，就會產生嚴重的後果：參數估計量的方差不具有最小方差性；估計與預測的精度降低。
  14. Firstly, several methods are used to test if there is heteroscedasticity in the data. then some variance stabilizing transformation methods are applied to the data. finally, it is pointed out that the least squares fitting may be used to the transformed data

    先用幾種方法對數據是否具有異方差性進行檢驗，然後選擇適當的方法進行變換，最後指出，可以通過對新模型作最小二乘擬合等方法，觀察變換后的模型其數據的擬合程度，以確定模型的優劣。
  15. The third chapter " essay of emh on chinese stock market " tested the hypotheses for the emh on chinese stock market, presented that stock price and return rate variance and voiatiiity are not stable. the chapter provided some evidence for the non - - normai

    第二章分析了有效市場理論產生的背景，就有效市場理論成立的基本假設進行了檢驗，提出股票價格收益是不穩定的隨機序列，收益分佈不是正態分佈，股票價格收益表現出非性，序列自相關性，異方差性。
  16. The distributions studied are normal distribution, student - t distribution, skewed student - t distribution and general error distribution. besides this, considering the conditional heteroskedasticity of the time serial in financial market, apply the garch model into the estimation of var

    在此基礎上，研究了證券市場上時間序列收益率波動的條件異方差性，考慮中國證券市場的風險特徵，將garch系列模型與var模型相結合，構造了基於不同分佈條件下的var模型。
  17. As goldfeld - quandt test can only be applied to one independent variable, it is generalized in the second section. it shows that, in multivariate situation, the data can be arranged according to their principle components. but there should be a premise : the disturbances of the lower data group should have equal variance and those of the higher data group have the same variance

    由於戈德菲爾德-匡特檢驗方法只適用於一個自變量，因此，本文對g - q檢驗進行了推廣，說明在多變量的情況下，可以利用主成分對樣本數據進行排序，並強調使用戈德菲爾德-匡特檢驗的前提：低樣本組各觀察值的擾動項必須具有同方差性；高樣本組各觀察值的擾動項也必須具有同方差性，否則，檢驗的結果可能是錯誤的。
  18. The dissertation defines and develops the covariance performance function and proves that it can decide the fusion estimate covariance. the simulations identify the conclusions

    定義並提出了多傳感器系統的方差性能函數，從理論上嚴格證明了其與融合估計方差的關系，結論用模擬實驗得到了驗證。
  19. The object of this thesis for a master ' s degree is to study the existence of seasonality effect in shanghai and shenzhen a - share market. we use the return data of a - share indices ranging from july 21st, 1997 to the end of year 2000 to study this effect by employing five different asymmetric garch - m models. before the garch analysis this paper studied the detail in very detail and find that the data is not much different from the index returns from developed market : it is fat tailed, with high kurtosis

    本研究首先對選取的樣本? ?中國的上海和深圳兩個股票市場a -股綜合指數1997年7月21日到2002年12月31日間1316個交易日的收益率的數據分別進行了深入的分析，發現滬深兩市已經逐步趨于規范化，其指數收益率分佈具有明顯的尖峰、厚尾的特點；然後分別運用了ljung - boxq檢驗和增廣的dick - fuller檢驗，發現所研究的兩個市場的收益率都具有明顯的自相關性，並且都是穩定序列；最後利用white異方差檢驗和arch性檢驗，證明了本文所研究的樣本具有明顯的異方差性和顯著的arch效應，因此用自回歸條件異方差模型來研究中國股市的季節效應非常合適。
  20. In the end, according to the idea of inertial sensor group that comprises several same kind micromachined sensors, the fusion estimated algorithm of multisensor data is presented in this paper. it is theoretically proved that this algorithm has least mean square errors. as a result, more precise and reliable data can be obtained from the integrated output

    最後，基於將硅微慣性敏感元件構成慣性敏感器群的思想，本文應用了簡單而有效的多傳感器數據融合演算法，提高了綜合輸出的精度，得出了比單一慣性傳感器更可靠、更準確的測量結果；並在理論上證明演算法的最小方差性；計算機上的模擬結果也從實際應用上進一步說明了融合演算法的有效性。
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