抽樣變異性 的英文怎麼說

中文拼音 [chōuyàngbiànyìxìng]
抽樣變異性 英文
sampling variability
  • 抽 : 動詞1 （把夾在中間的東西拉出; 提取） take out （from in between） 2 （從全部里取出一部分; 騰出） ...
  • 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
  • 異 : 形容詞1 （有分別; 不相同） different 2 （奇異; 特別） strange; unusual; extraordinary 3 （另外的;...
  • 性 : Ⅰ名詞1 （性格） nature; character; disposition 2 （性能; 性質） property; quality 3 （性別） sex ...
  • 抽樣 : [統計] sample; sampling; specimen; samples draw
  1. First, this paper gives an introduction of some methods of unequal probability sampling, their estimators and variance estimators, including sampling with pps with replacement, methods of sampling without replacement suggested by brewer, durbin, sampford, des raj, murthy, rao - hartley - cochran. then, at the basis of rao and bayless ' s study, we consider that population can be splited two random subpopulations, which are respectively drawn from different infinite super - populations, and compare the stabilities of estimators of the methods that given above. we find that the minor difference between two super - populations has great effect on the efficiency of the estimators for the population with moderately large coefficient of variation ( c. v. )

    本文首先從理論上介紹了若干種不等概率抽樣方法，它們的估計量、估計量的方差及其估計，其中包括有放回ppz及pps抽樣，不放回不等概率抽樣中的brewer 、 durbin 、 sampford 、 desraj ， murthy 、 rao - hartley - cochran等人的方法；其次，在rao和bayless兩人就樣本單元數n = 2的情形對上述抽樣方法進行比較的基礎上，將總體隨機地分成兩個子總體，視每個子總體取自不同的線性超總體，在文中，我們利用計算機實現隨機分組，並通過畫圖比較各方法估計量的穩定性，結果表明，對變異系數c . v . （ x ）較大的總體而言，兩個超總體之間的微小差異將對估計量的穩定性產生很大的影響，從而說明rao和bayless的比較結果還不夠完善。
  2. It is the researchful purpose of this paper that the methods of appraising the existing structural reliability basing on own information are found, which will impel the methods of appraising the existing structural develop from applied methods to probability methods. the contents of this paper have mainly four, including : firstly, the normal value of permanent load in the existing structure is ascertained by the way that is called bayes - small capacity, which considers the dates of design and the road - test dates. secondly, by introducing the random variable that is statistical ambiguity, the statistics of loading and resistance of existing structure are researched

    本文研究目的是針對現有結構的特點，建立基於自身信息的現有結構可靠性的實用評定方法，推動我國的現有結構可靠性鑒定方法由實用鑒定法向概率鑒定法發展，主要研究內容包括四個方面：一、結合結構原設計數據和現場抽樣實測數據，研究了恆載標準值的統計推斷方法，提出bayes小樣本統計推斷方法；二、利用統計不定性隨機變量，結合現有結構的特點，提出荷載、抗力變異性的小樣本統計推斷方法；三、分析了現有結構抗力變異性的主要影響因素，並利用實測數據進行了實例分析；四、針對現有結構自身的荷載、抗力統計特性，研究了現有結構承載力的校核表達式，對恆載、抗力分項系數提出修訂建議，建立了基於自身信息的現有結構可靠性實用評定方法。
  3. This research established an estimating model of pinus massoniana stand volume with the elements as variates directly obtained from rs and the conditions of stand that were extracted from 130 samples of pinus massoniana stand from the fifth forest resource continuous investigation data in min - jiang watershed and flitered by the thrice standard deviation method and liner regression method and the correlation coefficient is 0. 735 the suitability and precision of the model were tested and regression analysised with data that were extracted from another 30 samples

    摘要從福建省第5次森林資源一類調查落在閩江流域的樣地中抽取馬尾松林樣地130個，以rs可提取因子及樣地林分立地條件因子為可選變量，利用3倍標準差法進行異常數據的篩選，對林分立地條件定性因子進行數量化處理，通過逐步回歸構建閩江流域馬尾松林分蓄積量估測模型，研究結果所構建的蓄積量估測模型的相關系數為0 . 735 。
  4. Objective to establish a complex pcr method and to investigate the genetic polymorphism and population difference of three loci on y - chromosome, so as to provide a database for forensic medicine casework. methods edta - blood specimens were collected from 163 unrelated males in han population in taiyuan. different tissues of one corpse were analyzed including blood, muscle, liver and kidney

    方法（ 1 ）樣本採集：隨機抽取163名太原地區漢族無親緣關系的男性個體的靜脈血， edta抗凝，進行dys390 、 dys391和dys393基因座等位基因及單倍型頻率分佈調查；採集同一屍體血液、肌肉、肝臟、腎組織進行同一性檢測；採集20例兩代家系血進行突變觀察；取20例女性個體血進行男性特異性檢驗。
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