sample variance 中文意思是什麼
sample variance
解釋
采樣方差-
The method proposed in this thesis do well in solving the problems of multi - damping - ratio - spectra simulation. it is convenient to obtain the pareto optimal solution set of the multi - object question by using implicit parallel genetic algorithms and the method can meet the practical needs for simulating ground motions coinciding with multi - damping - ratio - spectra in seismic design. the crossing rate and variance rate are important parameters of genetic algorithms which affect the rate of convergence, the adapting rate of cross and variation in this paper can auto - adapt and according to stand or fall of current sample, it assures the sample approach to the pareto optimal solution set in fast convergent speed
較好地解決多阻尼比反應譜擬合問題；本文方法通過一次運行就能獲得一組具有集系特性的地震動，在擬合多阻尼比反應譜的人造地震波集系的模擬方面有傳統方法所不能比擬的優勢，產生的人造波或人造波集系可滿足工程抗震設計需要；在遺傳演算法中，交叉概率和變異概率是影響收斂速度的重要參數，本文採用的改進自適應交叉概率和變異概率，可以根據當前樣本的好壞程度來自動地選擇適當的交叉概率和變異概率，以保證演算法始終以較好的速度向pareto最優解集逼近。 -
As to the selection of neural network input node, not only is related historical load was introduced as ? the drilling sample, but also influence of temperature and weather sensitive factors to the load variance is considered. 4
在神經網路輸入節摘要點的選擇方面，除了引入相關歷史負荷作訓練樣本外，還考慮了溫度、氣候敏感因素和特徵日對負荷變化的影響，提高了負荷預測的精度。 -
In chapter 1, the author first study the two - stage confidece intervals for the variance of a normal distribution, then work out the optimal sample size of the first stage by numerical computations and establish a proof for the non - existence of fixed - size sampling
在第1章里，作者首先研究了正態總體方差的兩步置信區間，並用數值計算的方法給出了第一步的最優抽樣量，且證明了固定樣本抽樣的不存在性。 -
The present methods for testing the large - scale corpus segmentation have the following faults : a. it is difficult to exactly estimating the variance of population ; b. the sampling quantity is too large to test the corpus segmentation. to solve the given problems, we put forward the testing method based on clustering, which sorts the sample of corpus into many group by clustering them
語料庫分詞質量的評價問題是漢語語料庫的特有問題，已有的簡單隨機抽樣的方法，當語料庫規模變大時，無法精確估計分詞質量評價中語料庫樣本的總體方差，同時，為了保證檢驗的精度，傳統抽樣方法的檢驗費用太高。 -
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。 -
In local chemical exploration, the variance analysis of three - stage - model must be applied to estimate analytical uncertainly and sample - collecting error
摘要在區域化探中必須應用三層套合方差分析對樣品的采樣誤差和分析誤差進行統計分析。 -
Determining the sample size is crucial for a survey sampling design, for which traditional approaches have to seek some information on population variance or survey costs, however, which may result in either sample size too small and real precision undre desired level, or sample size too large and waste of survey costs
摘要樣本量的確定是抽樣設計中的關鍵問題，傳統方法利用總體方差和調查費用的有關信息來確定樣本量可能產生兩種結果，一種是樣本量過低，無法保證希望的估計精度要求；一種是樣本量過高，導致調查經費的浪費。 -
And then, adopting the same model, cyclic moment estimation statistic of different orders are constructed respectively, large sample variance expressions of the estimator through theoretic analysis are derived, as well as the constraint relation of estimator performance and noise statistical characteristic. the curve of estimation performance is obtained through monte carlo simulation test, which proves the related conclusion derived
然後，論文同樣以加性和乘性噪聲聯合干擾下的復諧波信號和復線性調頻信號為觀測模型，分別構造了基於不同階次的循環矩估計量，從理論上推導出了估計量的大樣本方差表達式，分析了估計量性能與噪聲統計特性的約束關系，通過monte - carlo模擬試驗得到了估計性能的曲線，驗證了推導的有關結論。 -
In chapter 3 we analyze a useful statistical method - projection pursuit ( pp ), including its basic theory and application. we put out definitions of projection index and projection pursuit, then prove that pca is a special case of pp with sample variance as projection index and list some indices often used. in section 3. 3 we apply pp with information divergence index to hyperspectral image, and demonstrate the advanced ability of it by the comparison between it and pca
第三章圍繞一種新興的統計降維方法? ?投影尋蹤展開討論，概述投影尋蹤的一般理論，定義了投影指標和投影尋蹤的概念，證明了傳統的主成分分析方法是投影尋蹤的一個特例，證明了正態性與friedman指標為0的等價性；第三節針對高光譜圖像處理問題，從實例和理論兩個方面，論證了以信息散度為指標的投影尋蹤方法在提取信息的能力上優于以方差大小作為衡量信息量多少標準的主成分分析方法。 -
Basing on the different study methods as interviewing, questionnaire and experiment, the subjects analyzed the dates collected from the male and female college students of different majors, different grades and different universities ( the size of testees " sample is 635 ) with different statistical ways as the reliability and validity of the self - developed scales, also methods of variance analysis, correlation, efa, cfa, regression, sem etc. major findings are as follows : ( 1 ) questionnaires of interpersonal interaction behavior of college students can be put into use, also does the questionnaires of attitude towards intercourse on internet
研究運用訪談法、問卷法、實驗法，以武漢市不同大學不同專業不同年級共635位男女大學生為正式被試，使用方差分析、相關分析、回歸分析、探索性因素分析、驗證性因素分析等統計方法對所收集的數據進行分析，對自編的人際交往行為問卷、網上人際交往態度問卷進行項目分析、信效度檢驗，探索變量之間的關系，結果發現： （ 1 ）自編問卷能被用來參與正式統計。 -
3. making the 20 weeks returns ratios ( from november 14, 2005 to april 7, 2006 ) of the debt index of shanghai security, the ingredient index of shenzhen security as a sample, and make the empirical analysis to the commonly using risk measure method, such as variance, lpms, var
3 .以上證國債指數、深證成分指數在2005年11月14日到2006年4月7日共20個周收益率為樣本，對常用的方差、 lpms 、 var風險度量方法進行了實證分析。 -
Via numeric sample analysis, it is found that evaluation functions are constructed by weighing principal components for pca. however, evaluation functions can be quite different when there are more than three principal components and characteristic vectors other than first one are chosen in different directions. for spca, variance contribution can be greater than 90 % by selecting just one principle component
將譜主成分分析應用於多指標評價系統中，通過數值例子分析：主成分分析是通過對各個主成分加權構造評價函數，當主成分個數不小三個時，從第二個特徵向量開始，對方向的不同選取，可導致評價函數的極大差異：而用譜主成分分析，能做到只取一個譜主成分就可使方差貢獻率大於90 。 -
Based on the port and waterway superintendence units, we study and screen the detailed method for the sample survey of whole industry waterway transportation volume, including selecting detailed sampling method, determining the appropriate sampling size, designing the calculation formula of all target estimators and their variance estimation
包括選定具體的抽樣方法，確定合適的樣本量，給出需估計目標量的估計公式及估計量的精度公式，制定詳細的樣本調查規定和編制科學合理的樣本調查表等。 -
In sample problem studying, the optimal source direction biasing parameter p1 、 exponential transform parameter p2 are supposed and the variance of duct calculating results by using this method is shown to reduce efficiently
提出了算例問題的最佳源方向偏倚參數p1和指數變換參數p2 ，得到的耦合抽樣方法更能有效降低計算結果的方差。
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