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均匀分布样本最大值之比的分布AI 解读

When there is a priori knowledge that two samples have been drawn from rectangular populations with the same lower bounds, the hypothesis that both samples have been drawn from the same population can be tested by means of the quotient of the maximum values. The distribution of this statistic is derived, and its properties studied. Explicit expressions for the power function of the test are given, and the table of 5% values of the quotient is given for sample sizes up to…

航空工程中的时间序列问题AI 解读

* Presented at the 114th Annual Meeting of the American Statistical Association at Montreal, September 11, 1954. This paper reviews some recent applications of random process theory to problems in aeronautical engineering. A number of random type disturbances that cause aeronautical problems are described and some of their effects on the airplane indicated. Particular attention is given to the effects of atmospheric turbulence in giving rise to airplane loads and structural…

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均匀分布样本最大值之比的分布AI 解读

When there is a priori knowledge that two samples have been drawn from rectangular populations with the same lower bounds, the hypothesis that both samples have been drawn from the same population can be tested by means of the quotient of the maximum values. The distribution of this statistic is derived, and its properties studied. Explicit expressions for the power function of the test are given, and the table of 5% values of the quotient is given for sample sizes up to…

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实验推断的随机化理论AI 解读

The paper contains a description of the extent to which the use of randomization in experimental designs permits evaluation of the experimental results. The case considered is that in which the whole population of treatments is used with particular experimental material. A completely general mathematical specification of the design is given and the procedure by which linear models for the experimental results are derived is exemplified by the cases of the completely…

为估计自回归参数增加短时间序列的有效长度AI 解读

Techniques of overcoming biases in serial correlation coefficients computed from short linear autoregressive time-series are considered. Two alternative estimates of autocorrelation coefficients are suggested as probable improvements over the usual estimates based on averages of observations made over a seasonal period. The alternative estimates are obtained, for example, from 12 yearly series, one for each month, and are: 1. an average of serial coefficients computed from…

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通过抽样调查估计巴西咖啡收成AI 解读

This article describes the results of an investigation, carried out on behalf of the Instituto Brasileiro do Café, into the possibilities of estimating the Brazilian coffee crop by means of a permanent sampling survey. The state of São Paulo already has a general sampling survey for the principal crops. With some modification, this would furnish estimates with adequate precision for coffee. In the states of Minas Gerais, Rio de Janeiro and Paraná, there exist registers of…

美国人口普查局当前人口调查的重新设计AI 解读

In February 1954 a redesign of the Current Population Survey was introduced that provided for a more efficient system of field organization and supervision as well as some advances in methods. The sample is now spread over 230 areas instead of 68 areas with the same number of households as heretofore. A composite estimation procedure has been introduced which reduces the sampling variability for most estimates. Also, there has been a considerable reduction in the variance of…

零点具有离散概率质量的随机变量分布AI 解读

In a number of situations we are faced with the problem of determining efficient estimates of the mean and variance of a distribution specified by (i) a non-zero probability that the variable assumes a zero value, together with (ii) a conditional distribution for the positive values of the variable. This estimation problem is analyzed and its implications for the Pearson type III, exponential, lognormal and Poisson series conditional distributions are investigated. Two…

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不完整数据下的参数估计AI 解读

THE present note is concerned with a special case of the general problem of obtaining efficient estimators for the parameters of a normal multivariate population when the available sample data are incomplete in the sense that measures on all variables are not available for all individuals in the sample. Such fragmentary data may arise because part of the data are irretrievably lost (e.g., in an archaeological find), or because certain data were purposely not collected. The…

南斯拉夫1953年人口普查中的抽样方法AI 解读

* The author is very much indebted to Morris H. Hansen, U. S. Bureau of the Census, who read the manuscript and made a great number of suggestions for improving it.

净国内迁移估计中两类误差的考察AI 解读

Two sources of errors in the estimation of net internal migration are examined. First, errors arising from the use of a single set of survival rates in all 48 states are examined by estimating net migration in ten states using both a national life table and state life tables. It is estimated that the median error arising from this source is about 14 per cent of the estimate of net migration. The second source of error examined is underenumeration of the population. The…

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