“Stratified” means “in layers,” so in order to get a stratified random sample you first need to make the layers. What layers you have depends on characteristics of yourpopulation. For example, if you are surveying U.S. residents about their plans for retirement, you might want your l...
StratifiedRandomSample分层随机抽样 Chapter6IntroductiontoInferentialStatisticsSamplingandSamplingDesigns Whataresamples?Population母體 Sample樣本 σ2 Sampling抽樣 x Ѕ2 Generalization推論 Parameter參數Statistic統計量 誤差 Differencesbetweenparametersandstatistics=error •samplingerror抽樣誤差•non-sampling...
sample statistics for stratapopulation parameters estimationThis chapter contains sections titleddoi:10.1002/9780470374597.ch5Paul S. LevyStanley LemeshowJohn Wiley & Sons, Inc.Levy, PS and Lemeshow, S. 1999 . “Stratification and stratified random sampling”. In Sampling of Populations; Methods and ...
Noun1.stratified sample- the population is divided into strata and a random sample is taken from each stratum proportional sample,representative sample statistics- a branch of applied mathematics concerned with the collection and interpretation of quantitative data and the use of probability theory to ...
. They showed that if the stratification is done based on a balanced ranked set sample in which each judgment class has an equal number of measured observations, the estimators are unbiased. They also showed that the ranked set sample mean is more efficient than a simple random sample mean ...
1. Consider a random sample X1,X2,…,Xn from a population with distribution function F∈F. Assume that Xi has finite fourth moment. In general, the population variance σ2 is estimated by the sample v...
sample distri... statistics representativ... proportional... stratified... Synonyms for stratified sample nounthe population is divided into strata and a random sample is taken from each stratum Synonyms proportional sample representative sample ...
Suppose thatYi1,…,Yiniis a simple random sample of the objective variable from theith stratum. Then we may construct estimators ofθ(F)by combining Hoeffding’sU-statistics as follows:θˆ=∑i=1Lwiθˆi,whereθˆi=1ni∑α=1niϕ(Yiα).It is known thatU-statistics (1.3) is the...
months of graduation. The researcher would find that there were almost 200,000 MBA graduates that year. They could take a simple random sample of 50,000 graduates and run a survey. They could divide the population into strata and take a random sample from the strata, however, to learn ...
6) Random sample 随机样本 1. Let X(1),…,X(n) denote the order statistics of a random sample,X1,…,Xnfrom a continuous population. 设X(1),…,X(n)是来自于一个连续分布总体的随机样本X1,…,Xn的秩序统计量,给出了任意两个秩序统计量的联合分布函数和联合密度函数的推导证明,从而为其进一步应...