摘要:

Because graduate students in statistics are given little, if any, preparation for actual consulting, they are prone, particularly in their early years, to commit errors of the third kind, many of which could be avoided if the students were properly trained. Errors of the third kind are defined and are illustrated with actual examples from consulting experience. The cases used represent types of error which result from different situations that arise frequently in practice. Some discussion is included of possible remedies for this problem that are suggested by the experience of educators in other fields.

ISSN:0162-1459    

DOI:10.1080/01621459.1957.10501374

出版商:Taylor & Francis Group    

年代:1957

数据来源: Taylor

ISSN:0162-1459    

DOI:10.1080/01621459.1957.10501375

出版商:Taylor & Francis Group    

年代:1957

数据来源: Taylor

ISSN:0162-1459    

DOI:10.1080/01621459.1957.10501376

出版商:Taylor & Francis Group    

年代:1957

数据来源: Taylor

摘要:

Actuarial methods are applied to data obtained from two household surveys to derive a measure of the service-life expectancy of household goods under one owner. This measure is of value to economists concerned with family budgets, and to manufacturers and distributors interested in knowing how often the consumer will enter the market. Although the samples obtained in the two surveys were too small to yield reliable estimates of service life, the data are used to illustrate the problems encountered and techniques used. Recommendations are made concerning schedule design and field procedures.

ISSN:0162-1459    

DOI:10.1080/01621459.1957.10501377

出版商:Taylor & Francis Group    

年代:1957

数据来源: Taylor

摘要:

There are a large number (p) of correlated variables to be controlled in a photographic process. Independent control charts for each would lead to a considerable misstatement of the Type I error for the system as a whole. The use of Hotelling'sTmay involve computational problems if the determinant is near zero. Since this would imply that the rank of the matrix is less thanp, k<plinear combinations of the original variates are obtained by the method of principal components. These new variates are used both for short and long range control with some simplifications when the short range procedures are to be handled by production personnel.

ISSN:0162-1459    

DOI:10.1080/01621459.1957.10501378

出版商:Taylor & Francis Group    

年代:1957

数据来源: Taylor

摘要:

* Research sponsored by the Office of Naval Research.

ISSN:0162-1459    

DOI:10.1080/01621459.1957.10501379

出版商:Taylor & Francis Group    

年代:1957

数据来源: Taylor

摘要:

Under the usual assumptions for the recovery of inter-block information there may exist two independent variance-ratio tests for testing every null hypothesis pertaining to the treatments. A method is suggested for combining two independent tests, and an example shows the gain in power from using the second test. Exact confidence limits are given for the ratio of the inter-block variance to the intra-block variance.

ISSN:0162-1459    

DOI:10.1080/01621459.1957.10501380

出版商:Taylor & Francis Group    

年代:1957

数据来源: Taylor

摘要:

A brief history of the Latin square design is given. A generalization of the design to the case in which the rows, columns and treatments represented in the experiment are samples from populations of rows, columns and treatments respectively is studied. A possible frame of reference for the interpretation of the experimental results is described. The leads to what is termed a “population model,” various population parameters, means and components of variation which are of interest to the experimenter. No assumptions are made about additivity of experimental units and treatments. Results on expectations of mean squares in the analysis of variance are given in terms of quantities (denoted by [Sgrave]'s) which result in a concise description and in terms of the components of variation. Biases in the estimation of components of variation by means of the analysis of variance are discussed and assessed. Comparisons of randomized block designs and Latin square designs are given for the general case of non-additive treatments for random, mixed, or fixed population of rows and columns. A generalization of the design is discussed. The mathematical machinery which is used to derive the results is presented briefly. Finally linear estimates and errors of estimates are discussed. One main conclusion of the study is that the Latin square analysis of variance may overestimate the error of treatment comparisons and underestimate the component of variation associated with treatment main effects.

ISSN:0162-1459    

DOI:10.1080/01621459.1957.10501381

出版商:Taylor & Francis Group    

年代:1957

数据来源: Taylor

ISSN:0162-1459    

DOI:10.1080/01621459.1957.10501382

出版商:Taylor & Francis Group    

年代:1957

数据来源: Taylor

摘要:

It is the purpose of this paper to present a method which will enable the construction of a set of stochastically dependent normal variables from a set of independent normal variables.

ISSN:0162-1459    

DOI:10.1080/01621459.1957.10501383

出版商:Taylor & Francis Group    

年代:1957

数据来源: Taylor