sampling population 中文意思是什麼

sampling population 解釋
抽樣總體
  • sampling : n. 1. 取樣（品），取標（本）〈指行動或程序〉。2. 樣品，標本。3. 剽竊拼湊歌曲。
  • 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. The growth dynamics of tree basal area of form. taxus chinensis var. mairei population in different altitude were discussed using the liu - logistic model, and the results showed that the altutide of 790 meters is more suitable to the survive of form. toms chinensis var. mairei population than 990 meters. plot sampling was selected and dynamic analysis was used to study the height structure of taxus chinensis var. mairei population, and the quadrate picture of height structure and the curve of survival rate were drew

    運用改進模型對南方紅豆杉種群在不同海拔梯度的種群優勢度增長進行了探討，表明海拔790m處的南方紅豆杉具有較大的環境容納量，但增長速度不快，海拔990m處的南方紅豆杉種群環境容納量不高，但具有較大的增長速度，這可能與群落的發育階段不同有關，兩地海拔均為南方紅豆杉適宜的生長海拔高度，相比而言，海拔790m的珍稀瀕危植物南方紅豆杉種群數量特徵的研究高度更宜於南方紅豆杉種群的生長。
  2. The department of ecology and biodiversity of the university of hong kong has been appointed to carry out the 2001 - 02 programme. the main aspects of monitoring include sampling of marine benthic animals, analysing bird population data, habitat extent and conditions. cross reference will be made to environmental data such as mudflat sedimentation, water quality, sediment quality and land use changes

    香港大學的生態學及生物多樣化學系，獲委派進行二零零一至零二年度的計劃，主要監測范圍包括抽樣調查海洋底棲動物、分析鳥類種群數據、生境分佈及狀況；亦會參考相關的環境數據，例如泥灘的沉積情況、水質、沉積物的質素、土地用途改變等，作為對照。
  3. Based on extensive field observation and population sampling in 71 populations of 20 provinces, this dissertation investigates morphology, ecology, cytology, cytogeography and its sequences of this complex. the results show that a. ageratoides polyploid complex might be originated in northeastern china, from which it migrated along three different routes

    本研究基於對我國20個省、市、自治區43個地點71個三脈紫菀復合體居群的野外觀察和採集，從形態學、生態學、細胞學、細胞地理學和分子生物學等各方面，對三脈紫菀多倍體復合體進行了綜合性研究。
  4. The mechanism about seed actual reproduction and artificial restoration under disturbance was investigated by using systematic sampling in the typical area of reaumuria soongorica population at mid - young age in desert grassland region, according to two similar habitate involved five different disturbance characteristics

    摘要2003年7 10月，選擇黃土丘陵區荒漠草原地帶兩個相似生境、 5個不同干擾特徵的中幼齡紅砂種群更新恢復類型區為研究物件，採用系統取樣法或樣行法，開展了干擾條件下的紅砂種群種子更新與恢復機理的初步研究。
  5. 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。
  6. Of the species, . characters of ecology, reproductive biology, genetic diversity, population genetic structure, endangering mechanisms, and sampling strategy have been studied in view of conservation biology. the results may be summarized as follows : by field investigation, we found that the localities recorded for four specimens of d. versipellis and d. pleiantha had disappeared, and most of the present populations are located in protected subforests. the distributional range of d. versipellis has also been reduced greatly, evidently, the number of present populations has decreased, the resources are reduced sharply, and the species are clearly endangered

    從保育生物學的角度，對八角蓮種群生態學和生物學特性、遺傳多樣性水平和遺傳結構、瀕危機制及保育取樣策略進行了研究，結果如下：通過野外調查發現，原標本記載的一些八角蓮和六角蓮種群已難以找到，該類群目前多分佈於自然保護區外圍次生林地帶，分佈范圍明顯縮小，現存群體的規模也明顯減少，資源量貧乏，物種處于瀕危狀況。
  7. The fourth chapter presents a concept of infinite population according to the features of ccga, and designs some particular methods for adversarial problems solving based on this concept. these methods include shared fitness, gene linkage, self - adapted mutation, phantom parasite, elitist population, shared sampling and brood selection. then we give the explanation and argumentation of these methods in theory and in experiment

    第四章根據ccga的特點，提出了無限群體的概念，並在此概念的基礎上就對抗性問題設計了幾種獨特的方法，這些方法包括：共享適應值、基因連鎖、摘要自適應變異、虛幻寄生體、精英群體、共享采樣和同胞選擇等，然後從理論和實驗上對這些方法給予的充分說明和論證。
  8. A study on spatial distribution pattern and sampling technique of population in natural pinus taiwanensis communities

    天然黃山松群落種群分佈格局取樣技術的研究
  9. The population sampling survey, conducted by shanghai municipal statistics bureau, reveals a rapid rise in the size of the unmarried population, especially women

    上海市統計局開展的一項人口抽樣調查顯示，上海未婚人口數量正在迅速上升，尤其是未婚女性數量。
  10. Only the water at jiekou had been eutrophic. the result of biological assessment was that the average density of phytoplankton at all the sampling spots was more than 1, 000, 000 per litre, indicating that the lake was eutrophic going by the population density. but this density of phytoplankton was higher than that in similar lakes at the same pollution level

    生物評價結果認為，千島湖浮遊藻類平均密度較同類營養水平的淡水水體高，其所有取樣點浮遊藻類平均密度都10 ~ 6個? l ，國內外一般認為當浮游植物平均密度10 ~ 6個? l時，其已經達到富營養化水平，因此單從浮游植物密度來看，可以認為千島湖已達到水體富營養化。
  11. Recommended by china disabled persons ' federation, the survey is carried out through delamination, isometry, probability and multistage sampling, 734 nationwide counties ( cities, districts ) and 5980 subdistricts is taken out, almost 2. 6 million people, 2 of the national population, is referred

    中國殘聯介紹，這次殘疾人抽樣調查採用分層、等距、概率比例、多階段抽樣方法，從全國范圍內抽取了734個縣（市、區） 5980個調查小區，設計樣本量近260萬人，佔全國總人口的2 。
  12. 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。
  13. The following merits can gain by using the clustering method : a. the sampling quantity can be reduced by using the method to test the segmentation of the large - scale corpus ; b. the testing precision can be improved and the variance of population can be estimated more exactly

    與已有的簡單隨機抽樣方法相比，本文提出的方法在大規模語料庫分詞質量評價時，有如下優點； a通過聚類得到語料庫抽樣樣本分詞正確率的分層知識，進而在檢驗中運用分層抽樣帶來的增益減少檢驗的費用： b
  14. Multi - stage stratified cluster sampling with proportional allocation was used to determine the study population, which was equal to approximately 0. 5 % of all students in that age group in taiwan

    本研究以結構性問卷進行資料收集，以分層集束抽樣方法，依國中、高中、高職、專科（五專的一至三年級）等類別分層，按學生人數比例，抽取總學生人數的0 . 5 %為研究樣本。
  15. Application of taylor ' s power law to sampling design of insect population

    冪法則在昆蟲種群抽樣設計方面的應用
  16. By comparing the calculation methods of chird number parity progression ratios parity progression ratios and based on the data of 1 national population sampling survey of 2000, this paper calculate the child number parity progressive ratios respectively by the variables of age, urban - rural and region to reveal the levels and distribution of the lifetime fertility of chinese women

    摘要通過孩次遞進比計算方法的比較選擇，本文運用第五次全國人口普查1抽樣數據分別計算中國2000年育齡婦女的各年齡別孩次遞進比、城鄉孩次遞進比、區域孩次遞進比，揭示中國育齡婦女生育水平的分佈狀況。
  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. 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。
  19. Single sampling procedures and tables for product quality audit of small population by attributes

    產品質量監督小總體計數一次抽樣檢驗程序及抽樣表
  20. Because our country is broad and natural environment is various, the sampling population data ca n ' t reflect the condition of national population distribution accurately

    由於我國面積遼闊，自然條件多種多樣，因此人口的抽樣調查數據並不能準確的反映全國各地人口的實際分佈狀況。
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