sample population 中文意思是什麼

sample population 解釋
抽樣人口
  • sample : n 1 樣品，貨樣。2 標本；榜樣，實例。3 【統計】典型取樣，抽檢查。4 【電訊】信號瞬時值。5 【冶金】 ...
  • population : n. 1. 人口；人口總數；全體居民；人口的聚居。2. 物的全體[總數]；【生物學】蟲口；種群（量）；群體；族，組，個數；【統計學】對象總體，全域。3. 【物理學】布居；密度。4. 〈罕用語〉殖民。
  1. Previous researchers have always determined the sp atial distribution patterns ( sdp ) of castanopsis kawakamii with a sample - dis tance method. however, the distribution patterns may be affected by the quadrat si ze and, in the course of analysis, the density differences among the cluster plots are not considered ; therefore, differences of cluster plot size and the dispersi on degree among individuals of cluster plots can not be known. authers of this pa per have determined the spatial distribution patterns of castanopsis kawakamii population in different habitats by means of non - quadrat distance method and a nalysed the pattern intensity and grain of the sdp. the pattern intensity is defi ned with the relative density differences and the pattern grain can embody the d ispersion degree of the individuals in the plots, and the dispersion degree among the plots. the determined results are as follows. the intensities of the species range in order from strong to week : litsea mollifolia p. kawakamii i. purpure a r. cochinchinensis c. kawakamii c. carlessii d. oldphamii s. superba. the gra ins of the species queue in order from coarse to close : s. superba = litsea mollif olia r. cohinchinensis c. kawakamii = i. purpurea c. carlessii p. racemosam d. oldp hamii. these determined results tally basiclly with the results authers of this paper have got in determining the same plots by means of aggregate index access ing method. in view of this, it is held that the sdp of c. kawakamii is closely related to the habitats and biological features

    前人都是採用樣方方法對格氏栲種群數量的空間格局進行測定，而格局分佈有可能受樣方大小的影響，且分析過程中沒有涉及聚塊間密度差的問題，因而無法掌握種群的聚塊大小差別及聚塊內個體間的離散程度.本研究採用無樣方距離法，測定不同生境的格氏栲種群空間格局，分析格氏栲種群格局的強度和紋理.強度以聚塊和間隙的密度差來定義，紋理則是體現聚塊內個體間的離散程度與諸聚塊間的分離程度.測定結果表明，格氏栲種群格局強度從高到低排列次序為：木姜子蚊母樹冬青茜草樹格氏栲米櫧虎皮楠木荷；格局紋理從粗到細的順序是：木荷=木姜子茜草樹格氏栲=冬青米櫧蚊母樹虎皮楠.這一測定結果與作者採用聚集度指標測定相同樣地格氏栲種群空間格局的結果基本相符.因此，格氏栲空間格局類型及分佈與格氏栲生物學特性及生境的關系密切
  2. The regression line is derived from a sample and not from the entire population.

    樣本回歸線是根據一個樣本而不是根據完全總體推導出來的。
  3. Whenever we sample, we always miss some helpful information about the population.

    無論在什麼條件下進行抽樣，總會丟掉一些對于總體有用的信息。
  4. The sample contains both filling and pie crust, just as the population does.

    樣本與總體一樣，包括餡和皮。
  5. A population is a whole, and a sample is a fraction or segment of that whole.

    總體是所研究的現象全體；樣本則是總體中的一部分。
  6. A one - stage probability sample in which every member of the population has an equal chance of selection

    一種單一步驟概率抽樣法.人口中的每一個人都有同等的被抽取的機會
  7. A kind of probability sample in which a set interval is applied to a list often population to identity elements included in the sample ( e. g., picking every 10th name )

    一種概率抽樣.以一定的間隔來從人口名單中抽取所需的樣本（如:每隔10個人抽取一次）
  8. This formula used inverse regression and data fusion technical and maximum likelihood theory, then this method enabled random sample value obtained in ultrasonic and rebound method of different detection population to mix together effectively, and reach estimation of concrete strength

    該公式利用逆回歸理論、數據融合技術和最大似然原理，將回彈值和聲速值分別看作被解釋變量，將來自超聲法和回彈法不同量綱的檢測數據進行有效融合，得出混凝土強度的推定值，該推定結果具有無偏性和方差最小性質。
  9. A type of survey design in which one sample is drawn from the population at a point in time

    一種調查設計方法.每一個時間點從人口中抽取一個樣本
  10. The confidence level of inferences about the population based on such a sample is 95 %

    用該樣本數據對總體進行推論，置信度為95 % 。
  11. By sun, bo ( major : marine biology ) directed by professor zhang, guofan and dr. liu, xiao population genetics of four argopecten irradians cultured populations was analyzed by using random amplification polymorphism dna ( rapd ) techniques. and partial dna sequences of the internal transcribed spacers ( its ) from four representative samples ( one sample represent for each population ) were amplified by pcr and sequenced in order to stress the phylogenetic relationships of the four populations. besides, by rapd technique, two argopecten irradians families were studied to examine whether the hybridization experiments were successful and which family was more suitable to be materials in future genetic linkage map construction

    本文以海灣扇貝4個養殖群體為研究對象，採用隨機引物多態性dna （ rapd ）技術進行了群體遺傳學研究，並嘗試使用4個群體中代表個體的內轉錄間隔區（ its ）序列比對分析結果作為參考；另外，本文還運用rapd技術對人工異體交配的2個海灣扇貝家系的雜交成功率進行了分析，均獲得成功證實，並評估了兩個家系構建遺傳連鎖圖譜的潛力。
  12. Idea : we cannot measure the closeness of the estimates with the population parameter directly, but it is possible to use data from a random sample to construct a set of values that contains the true value with a certain specified probability

    我們無法直接衡量估計值和總體參數之間的距離，但是利用來自隨機樣本的數據構造一個取值的集合，使得真值在給定概率下屬于這個集合是可能的。
  13. A kind of sample in which every member of the population does not have a known probability of selection into the sample

    一種抽樣方法.即人口中的每個個體被選為樣本的概率不同.見方便抽樣，有目的抽樣，和定額抽樣
  14. The first order conditions are also the sample counterparts of the related population moments

    一階條件也是相關的總體矩在樣本中的對應。
  15. 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。
  16. Before we can understand what a particular sample can tell us about the population, we should first understand the uncertainty associated with taking a sample from a given population

    要能夠理解一個具體的樣本究竟能夠傳遞關于總體的什麼樣的信息，我們首先需要理解從一個給定的總體中抽取樣本時究竟有什麼樣的不確定性。
  17. 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。
  18. This essay analyses the principal factors affecting the difference in wage earnings of the floating population in xiamen city through utilizing the data from a series sample survey and establishing a multivariate regression model

    摘要本文利用廈門市流動人口系列抽樣調查數據，通過建立一個多元回歸模型來分析流動人口工資收入差異的主要影響因素。
  19. Based on the data from a sample survey entitled study of population childbearing willing in guangdong conducted by population and family planning committee of guangdong province and population institute of sun yat - sen university in october 2004, this paper analyzes the effect of individual features, policy and motives of chlidbearing on the desired childbearing number of guangdong population

    摘要本文利用廣東省人口與計劃生育委員會與中山大學人口研究所2004年10月進行的題為「廣東省人口生育意願研究」的抽樣調查數據，分析了個人因素、政策因素以及生育目的對廣東人口意願生育數量的影響。
  20. In this paper, i study above two issues and gain some results as follows : 1. under population follow normal distribution hypothesis, designing combine median - range adaptive control charts with variable sampling interval, variable sample size and variable control limit. it may be regarded as previously median - range extension

    在假設總體服從正態分佈的條件下，設計了抽樣區間，樣本容量和控制限都變化的全變化參數的中位值-極差聯合控制圖。它是以前的中位值-極差聯合動態控制圖的推廣。
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