摘要:

A general formula for the variance of Gini's mean difference, a measure of dispersion, is given in this paper for simple random sampling without replacement from a finite population. Formulas for estimating the variance are also given together with a numerical example. Similar results are developed for Gini's coefficient of concentration, a relative measure of dispersion.

ISSN:0162-1459    

DOI:10.1080/01621459.1962.10500553

出版商:Taylor & Francis Group    

年代:1962

数据来源: Taylor

摘要:

Several methods for analyzing seasonal variation are available. Most common among these are methods based on moving averages. One serious shortcoming of moving average methods is that the process of moving averages can introduce a fictitious degree of regularity into the seasonal pattern. An alternative method, harmonic analysis, is presented in this paper with an application to hog production data. The investigation illustrates the flexibility of harmonic analysis for measurement of patterns of seasonal variation. Hypotheses concerning changes in amplitude and phasing of the seasonal pattern are tested and a discussion of these procedures is presented.

ISSN:0162-1459    

DOI:10.1080/01621459.1962.10500554

出版商:Taylor & Francis Group    

年代:1962

数据来源: Taylor

摘要:

Many life testing procedures which have been developed involve continuous monitoring of the items under test. In storage deterioration problems, as an example, the failure of items can only be ascertained by means of inspection. Continuous observation, in these cases, is either not possible or not feasible. This paper is concerned with design problems related to the choice of the number and timing of inspections. A general class of survival functions is investigated and optimal procedures, for estimating parameters, derived. The efficiency is compared with continuous monitoring.

ISSN:0162-1459    

DOI:10.1080/01621459.1962.10500555

出版商:Taylor & Francis Group    

年代:1962

数据来源: Taylor

摘要:

The author collaborated on a nationwide study of low-income families conducted by the Survey Research Center of the University of Michigan. One of the primary purposes of this study was to determine some of the factors which are responsible for the low-income position of the 16 per cent of the nation's families who receive less than $2,000 a year.1Information on the incomes of low-income families with heads of working age was collected from a nationwide sample by personal interview techniques. Any bias in the reporting of income creates serious problems for such a study. Underreporting of income by low-income families would lead the analyst to believe that a higher proportion of families live on low incomes than is actually the case.

ISSN:0162-1459    

DOI:10.1080/01621459.1962.10500556

出版商:Taylor & Francis Group    

年代:1962

数据来源: Taylor

摘要:

In order to determine the reliabilities of successful outcomes (or failures) from a complex which consists of two independent systems each containing a series of independent trials, the product of two binomial series may be employed. In practical problems, however, some qualifications and constraints are generally imposed which render this approach to the problem awkward and difficult. In this article a complex consisting of a missile system and an integral but independent telemetry system is considered in devising a method to determine these reliabilities. Results indicate that the reliability of telemetry reports is high even when the systems reliabilities are not particularly high.

ISSN:0162-1459    

DOI:10.1080/01621459.1962.10500557

出版商:Taylor & Francis Group    

年代:1962

数据来源: Taylor

摘要:

Random Processes.Murray Rosenblatt.New York: Oxford University Press, 1962. Pp. x, 208. $6.00. Reviewed by Simeon M. Berman

ISSN:0162-1459    

DOI:10.1080/01621459.1962.10500558

出版商:Taylor & Francis Group    

年代:1962

数据来源: Taylor

摘要:

This article has no abstract

ISSN:0162-1459    

DOI:10.1080/01621459.1962.10500542

出版商:Taylor & Francis Group    

年代:1962

数据来源: Taylor