樣本偏差 的英文怎麼說

中文拼音 [yàngběnpiānchā]
樣本偏差 英文
sample bias
  • 樣 : Ⅰ名詞1. （形狀） appearance; shape 2. （樣品） sample; model; pattern Ⅱ量詞（表示事物的種類） kind; type
  • 本 : i 名詞1 （草木的莖或根）stem or root of plants 2 （事物的根源）foundation; origin; basis 3 （本錢...
  • 偏 : Ⅰ形容詞1 （不正; 歪斜） inclined to one side; slanting; leaning 2 （只側重一面） partial; prejudi...
  • 差 : 差Ⅰ名詞1 （不相同; 不相合） difference; dissimilarity 2 （差錯） mistake 3 [數學] （差數） differ...
  • 樣本 : sample book; specimen; advanced copy; sample; muster; scantling; instance; statistics
  1. The process of assigning mathematical weights in an attempt to correct over or underrepresentation of some groups in the unweighted in - tab sample. see sample weighting

    分配數學權重的過程.旨在修正未加權樣本對某些人群代表過度或代表不足的偏差
  2. Heckman, j. j. ( 1979 ), sample selection bias as a specification error, econometrica, 47, 153 - 161

    樣本選擇偏差，一看就知道是個很重要的問題嘛，排名第五，不算虧待。
  3. Compared with the classical bp algorithm, robust adaptive bp algorithm possesses some advantages as following : ( 1 ) increasing the accuracy of the network training by means of using both the relative and absolute residual to adjust the weight values ; ( 2 ) improve the robustness and the network convergence rate through combining with the robust statistic technique by way of judging the values of the samples " relative residual to establish the energy function so that can suppress the effect on network training because of the samples with high noise disturbances ; ( 3 ) prevent entrapping into the local minima area and obtain the global optimal result owing to setting the learning rate to be the function of the errors and the error gradients when network is trained. the learning rate of the weights update change with the error values of the network adaptively so that can easily get rid of the disadvantage of the classical bp algorithm that is liable to entrap into the local minima areas

    與基本bp演算法相比，本文提出的魯棒自適應bp演算法具有以下優點： （ 1 ）與魯棒統計技術相結合，通過訓練樣本相對偏差的大小，確定不同訓練樣本對能量函數的貢獻，來抑制含高噪聲干擾樣本對網路訓練的不良影響，從而增強訓練的魯棒性，提高網路訓練的收斂速度； （ 2 ）採用相對偏差和絕對偏差兩種偏差形式對權值進行調整，提高了網路的訓練精度； （ 3 ）在採用梯度下降演算法對權值進行調整的基礎上，通過將學習速率設為訓練誤差及誤差梯度的特殊函數，使學習速率依賴于網路訓練時誤差瞬時的變化而自適應的改變，從而可以克服基本bp演算法容易陷入局部極小區域的弊端，使訓練過程能夠很快的「跳出」局部極小區域而達到全局最優。
  4. Through the theory of light radiation and intensity, we can use the fewest leds to satisfy the luminous intensity demand. through image segmentation theory, we can accurately pick module up from the test stripe when it is put in wrong directions. through image processing theory, we can acquire correct information and avoid the bad effects from the asymmetric chemistry reaction and instability of the devices

    用光的輻射和強度理論，我們計算出了獲得足夠圖像強度所需的最少光源;用圖像分割理論，我們在試紙條傾斜放置或有垂直方向上的偏移時，準確地提取出了各模塊的數據;用平滑濾波和均值濾波理論，我們濾除了由於反應不均勻及硬體設備不穩定帶來的噪聲;用交遇區設計線性分類器的方法，我們降低了有限樣本設計線性分類器帶來的誤差，提高了檢驗準確度。
  5. I suppose it would be a matter of perception, because i did see the majority of the story as background, as it is a re - telling of the original tv show, with both major and minor changes to the storyline

    我同意這是理解的偏差，因為我的確是覺得故事的多數是背景，照原樣原始的電視展示的改寫本，以對原本有了大和小的變化。
  6. The stability of electric power system has been being focused for a long time toprevent a power system from losing synchronism after sudden fault ， researchers have done much work and got many accomplishments this paper applied the direct feedback linearization ( dfl ) technique on the power system ， a strong nonlinear system simulation results by matlab proved this method efficiency main works and results are as follows ： this paper compared some existing methods in excitation control ， fast valve control and coordinated control respectively, analyzed the developments and actuality of nonlinear control research in brief, illustrated why ransient stability could be greatly improved by using the fast valve control in chapter 3 ， indicated the importance of coordinated control farther this paper introduced the inverse system theory, based on which ， discussed the dfl theory, pointed out which had consistency with the inverse theory, expanded the dfl theory combined the idiographic model equations ， made which adapt to the model of a single machine - infinite bus power system this paper referenced abundance articles and educed a set of equations ， which could describe the dynamical process of excitation and fast valve control for synchronous generators in the equations ， there were several very important parameters of power system - - rotor angle ( ) ， rotor speed ( ) ， generator q axis voltage ( eq ) ， transient voltage ( e ' q ) ， active power ( pe ) ， mechanical input power ( pm ) ， valve opening ( ) ， generator terminal voltage ( vt ) ， based on the model ， nonlinear coordinated controller and terminal voltage optimal controller have been designed by using the expanded dfl theory and lq optimal control theory the simulation results showed that the controller could keep power system transiently stable under the effects of a symmetrical 3 - phase short circuit fault ， which achieved better postfault regulation compared with another two routine methods ， one is the proportion excitation controller and proportion fast valve controller, the other is the proportion excitation controller and the optimal fast valve controller, which could exert good performance when met 1ittle disturbance either

    在介紹逆系統理論的基礎上，詳細介紹了dfl理論，通過比較闡明了dfl理論其本質是逆系統方法的一類，並結合具體課題推導出的模型方程將dfl理論進行了擴展，使之適應于電力系統這個強非線性對象。通過參考大量的書籍文獻推導出一套實用的可將大型汽輪發電機勵磁與汽門綜合起來進行控制的模型方程，此模型方程涵蓋了電力系統中特別引人注目的幾個量- -轉子角、轉子轉速、發電機q軸電勢eq 、暫態電勢e ' q 、有功功率pe 、機械功率pm 、汽門開度、機端電壓vt ，在此基礎上建立了實用的電力系統簡化的數學模型，並將擴展的dfl理論應用於此模型系統，結合線性二次型最優控制理論設計出大型汽輪發電機的非線性綜合控制器及機端電壓最優控制器，通過模擬實驗與採用常規的按電壓偏差進行調節的比例式勵磁控制器+汽門比例控制及採用常規的按電壓偏差進行調節的比例式勵磁調節器和基於二次型性能指標設計的最優快控汽門（考慮發電機的飽和因素）進行了對比，證實了採用此種控制器可以有效地提高電力系統的暫態穩定性，並且在電力系統遭受小干擾時同樣具有良好的調節性能。
  7. We propose in this paper an evaluation method for the transient performance of das, through the period signal, by utilizing the much smaller difference than sampling period between the multi - periods of signal and the multi - sampling periods, getting shorter equivalent sampling period ( i. e. higher equivalent sampling rate ), which is derived from input signal period and sampling period, and then, the problem that how to get the transient performance of das has been solved. the transfer function of das is then evaluated and identified, and practical test results are also presented

    本文介紹一種方法，通過對其加載特定的周期性輸入信號，使用采樣周期的整數倍和信號周期整數倍間的微小偏差，獲得比實際采樣周期小得多的等效采樣周期，從而解決了數據採集系統瞬態響應特性的獲取問題；並進而獲得了數據採集系統傳遞函數的辨識和評價結果，實現了數據採集系統瞬態特性的總體評價。
  8. Deviation control method to samples of number of eggs in percentage of good eggs of silkworm, bombyx mori

    桑蠶種良卵率調查中樣本間卵粒數的偏差控制方法
  9. The new measures are a function of the genetic distance between the marker locus and a qtl. through simulations, we found that when marker allele frequencies vary across loci, the previous hwd measures are biased and not powe

    計算機模擬表明，當各標記基因頻率不同時，用以前的hwd指數精細定位會產生偏差，新的指數可以有效的進行精細定位，使用y > u和y < t的樣本的lcd的功效普遍比僅僅使用y > u的樣本的氣回，的功效高。
  10. At the same time, several practical algorithms, included nipals and simpls, were proposed and their main s as codes were given in appendices. through comparing four techniques of outlier test with each other, we summarized their respective advantages and disadvantages of each techniques and clarify the their distinct usages

    同時，也簡要介紹了偏最小二乘回歸的四種離群點檢測方法，即偏f檢驗、殘差圖與正態分位數圖、主成份圖（ t t圖） 、樣本點貢獻圖。
  11. In this paper, the notion of likelihood ratio, as a measure of deviation between a sequence of the arbitrary random variables and a sequence of independent random variables with different distributions, is introduced. a class of strong deviation theorems represented by inequalities are given on a subset of the sample space by constructing a negative supermartingale and using martingale convergence theorem

    本文通過引進似然比作為相依隨機變量序列相對于服從不同分佈的獨立隨機變量序列的偏差的一種度量，並通過構造一個非負上鞅，利用鞅收斂定理給出了樣本空間的一個子集上的一類用不等式表示的強偏差定理。
  12. Then, this paper empirically tested the validation and predictive accuracy of different var risk management model in the domestic financial market. finally, with the analysis of modem financial risk management development trend and the current domestic financial risk management situation, this paper made a prospect for the application of this model in the construction of domestic financial risk management system. through the analysis, the main conclusions are as follows : ( l ) the traditional mean - variance model is the special example of the portfolio selection based on the var risk management model for the case that the returns of the portfolio are assumed to be normally distributed ; compared with the mean - variance model, the var risk management model is more comprehensive and accurate in the measurement of the portfolio risk, so based on the var model, the investors can allocate the asset more effectively. ( 2 ) the var risk management model can provide the timely and comprehensive risk information for the top risk manager, so it is very helpful to the improvement of total risk management efficiency. ( 3 ) based on the var model, the raroc performance valuation approach can reflect the real performance of the portfolio manager and provide the coherent standard for the allocation of risk limitation and the construction of the incentive compatibility constraint mechanism in the financial instiutions

    通過研究分析，本文主要得出如下結論： （ 1 ）傳統的markowitz均值? ?方差模型僅僅是在資產組合收益率正態分佈假設條件下基於var風險管理模型進行資產組合選擇的特例，與均值? ?方差模型中的方差風險度量方法相比， var風險管理模型能夠更全面、更貼切地衡量資產組合的風險，且基於此模型能夠更有效地進行資產配置決策； （ 2 ） var風險管理模型能夠滿足更高層次風險管理者對風險信息的需求，有助於整體風險管理效率的提高； （ 3 ）基於var風險管理模型的raroc績效評價能夠反映資產組合管理人的真實業績，從而為金融機構風險限額的分配和激勵約束機制的制定提供統一的標準； （ 4 ）國內證券市場資產組合收益率服從正態分佈的假設明顯不成立，實證檢驗表明基於資產組合收益率正態分佈假設條件下的方差? ?協方差模型對國內資產組合風險的預測存在較大的偏差，由於文中證明在收益率正態分佈假設條件下基於方差? ?協方差模型進行資產組合選擇的結果等價于markowitz的均值? ?方差模型，因此，均值? ?方差模型對國內資產組合風險的預測同樣會存在著較大的偏差，而半參數var風險管理模型則能夠取得較好的預測衡量效果； （ 5 ） var風險管理模型符合未來金融風險管理的發展趨勢，基於var風險管理模型建立內容提要風險限額內控體系、風險信息披露體系和業績評價體系，並進行金融監管，將有助於國內金融機構內部風險管理方法和外部監管技術跟上國際金融風險管理的發展潮流。
  13. According to the requirements to pd pattern auto - recognition, this paper studies systematically the basic theories and realizable methods for auto - recognition of pd gray intensity image : ( 1 ) in the requirement of on - line pd monitoring for transformer, several discharge models are designed and the relevant experiment methods projected. with discharge model tests, a lot of discharge sample data is acquired. on the base of systematical research on recognition for pd gray intensity image, this paper puts forward two kinds of fractal features, the 2nd generalized dimensions of original pd images and fractal dimensions of high gray intensity pd images, and then the relevant extraction methods

    針對局部放電模式自動識別的需要，作者系統地研究了局部放電灰度圖像自動識別中的基本理論和實現方法： （ 1 ）根據變壓器局部放電在線監測的要求，設計了放電模型和實驗方法，並通過模型實驗獲得了大量放電樣本數據，為構造局部放電灰度圖像和採用bpnn進行識別作好準備； （ 2 ）研究了局部放電灰度圖像的構造方法以及降維構造32 32灰度和矩陣的方法；在用人工神經網路對局部放電進行模式識別時，分析了bp網路的優缺點，對典型bp網路的結構和學習訓練演算法提出了改進，採用帶有偏差單元的遞歸神經網路作為模式分類器；採用32 32灰度和矩陣進行bpnn識別結果表明這種方法是有效的。
  14. This paper uses arch model method in econometrics to set up an auto - regression model with different variance characteristic, which catches to the signal of herd behavior that can be comparatively sensitive. basing on the sample stocks of the index 180 of sse for studying sample, author conduct empirical tests on the non - linear relations between csad ( cross - sectional absolute deviation of returns ) and the market returns to judge whether the herd behavior in the stock market of china is remarkable. according to the empirical analysis, author finds, both in the up - market and down - market, certain herd behavior exist on the stock market of our country

    本文運用計量經濟學中的arch模型方法，建立了一個能較為敏感的捕捉到羊群行為信號的具有異方差特性的自回歸模型，以上證180指數樣本股為研究樣本，通過檢驗個股截面收益的絕對偏差（ csad ）與市場組合收益的非線性關系，來判斷我國股市羊群行為是否顯著，通過實證分析，我們發現，無論是市場上漲階段還是下跌階段，我國股市都存在一定的羊群行為，同時，本文通過比較分析，對實證結果進行深入的剖析，對羊群行為的形成原因進行簡要的分析，並對如何控制羊群行為提出了一些政策性建議。
  15. This made a small - scale sampling to develop a database of school teacher ' s information literacy through, used regression analysis to determine the weight distribution of evaluation indicators by means of minimum sampling bias, and set up a set of quantitative indicators for the evaluation of teacher ' s information literacy

    摘要本文認為通過小范圍的教師樣本可獲取關于教師信息素養量化評價指標和總的教師信息素養數據，運用回歸分析法最小化樣本偏差可獲取各評價指標對應的合理的權重分佈，從而建立一個適應各學校實際情況的教師信息素養量化評價指標體系。
  16. About the confirmation of the position evaluation factors scale, the thesis has put forward using the fuzzy analytic hierarchy process ( fahp ) to evade subjective factor influence and make the position evaluation system more scientific. the thesis makes use of mathematics tools, such as the standard deviation of the sample, variation coefficient, etc. to analyze the deviation that the judge panel give a mark, and carry on effective correct ing

    其中在崗位評價因素權重的確定問題上，提出藉助模糊層次分析法（ fahp ）的系統理論來規避主觀因素的影響，使崗位評價體系的設計更趨科學化；還利用樣本標準差、變異系數等工具來分析評委打分的偏差，進行有效的糾錯處理。
  17. Research on the deviation control method of the number of good eggs of bombyx silkworm eggs ' samples

    桑蠶種樣本良卵數偏差控制方法研究
  18. This study used food surveillance data which might produce biased results in dietary exposure assessment, as they were examined chiefly for enforcement purpose and might contain higher levels of contaminants

    是次採用的食物監察數據主要是作執法用途，食物樣本的污染物含量水平會較高，因此會造成偏差，影響評估結果。
  19. Unbiased estimators are not necessarily consistent, but those whose variances shrink to zero as the sample size grows are consistent

    無偏估計量未必是一致的，但是那些當樣本容量增大時方差會收縮到零的無偏估計量是一致的。
  20. We make comparative analysis of technical efficiency, pure technical efficiency and scale efficiency while choosing the year1997and 2000 as the model samples. and we also study the degree of the efficiency departure between banks through variance analysis while comparison of the efficiency is made between state - owned commercial banks and the newly founded banks chronologically

    橫向上重點選取1997年和2000年為典型樣本點對各銀行的技術效率、純技術效率和規模效率進行了比較分析；縱向上按時間順序比較了國有銀行和新興銀行的效率，並通過方差分析研究了銀行間的效率偏離程度。
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