摘要:

* Presidential address delivered at the 109th Annual Meeting of the American Statistical Association on December 28, 1949.

ISSN:0162-1459    

DOI:10.1080/01621459.1950.10483331

出版商:Taylor & Francis Group    

年代:1950

数据来源: Taylor

摘要:

There is need for a reliable and authoritative index measuring the production of minerals in the United States in terms of physical quantity from the time when each of the mineral industries became an important factor in the national economy to the present. It is our hope that the annual index of mineral production for the period 1880 to 1948, together with the indexes for important mineral groups, as described here, will fill this need.1Sixty-three annual physical volume series on mineral production have been selected for inclusion in the index.

ISSN:0162-1459    

DOI:10.1080/01621459.1950.10483332

出版商:Taylor & Francis Group    

年代:1950

数据来源: Taylor

摘要:

Our purpose is to consider the efficiency of the county as the primary sampling unit for making state estimates of some socio-economic and agricultural characteristics of the farm population in North Carolina. The main emphasis is on the general purpose type of survey for the State as a whole—one in which both socio-economic and agricultural characteristics are to be estimated; the study is not directed at obtaining ‘best’ estimates for specialized items. Calculations herein presented indicate that the county is not a very efficient primary sampling unit for state estimates. It is expected that future investigation will show that the minor civil division, or some better defined statistical area of comparable size, will produce better results. Variances and relative costs need to be calculated, however, before it is possible to evaluate the relative gains of the smaller over the larger unit.

ISSN:0162-1459    

DOI:10.1080/01621459.1950.10483333

出版商:Taylor & Francis Group    

年代:1950

数据来源: Taylor

摘要:

The compilation and analysis of economic statistics for the countries of the world by various international organizations is of importance to research in international economics. However, the present situation is that statistics from certain countries, particularly the Soviet Union, when available at all, are not only not comparable with those of the rest of the world, but are issued for propaganda purposes and cannot be considered as statements of existing conditions. The problem which must be faced is whether to discontinue the publication of such statistics entirely in world reports, or whether it is possible to publish them in such a form that their weaknesses are clearly evident.

ISSN:0162-1459    

DOI:10.1080/01621459.1950.10483334

出版商:Taylor & Francis Group    

年代:1950

数据来源: Taylor

摘要:

This paper discusses the extension of discriminatory analysis to the case where the primary data are qualitative. The general principle in the use of the discriminant function in the case of two classes is to determine a set of adjustable coefficients so chosen as to maximize the ratio of the difference between sample means to the standard deviation within the two classes. When only a single chosen component is to be maximized relative to a set of other components, the equations are linear. In the case discussed here we have a two-way table of non-numerical observational data where the solution of equations of higher degree is required. Appropriate values are to be determined in order that the observations may be made as additive as possible. Application is made to the problem of scoring letter grades in school subjects so as to maximize individual differences.

ISSN:0162-1459    

DOI:10.1080/01621459.1950.10483335

出版商:Taylor & Francis Group    

年代:1950

数据来源: Taylor

摘要:

This article describes in non-mathematical fashion the technique suggested by H. B. Mann and A. Wald for selecting the number and width of class intervals for the chi-square test of goodness of fit when the null hypothesis distribution is continuous and completely specified. The number of classes is selected by means of a formula depending upon the sample size and the level of significance and the class limits are chosen such that each class contains the same number of items under the null hypothesis. Finally it is suggested that the number of classes as given by the formula may be halved for practical purposes.

ISSN:0162-1459    

DOI:10.1080/01621459.1950.10483336

出版商:Taylor & Francis Group    

年代:1950

数据来源: Taylor

摘要:

This paper describes simplified methods for fitting a Gompertz curve and a modified exponential curve. These methods, together with the one described by Spurr and Arnold1for fitting a logistic curve, are useful in determining which type of growth curve is most appropriate for a given set of data.

ISSN:0162-1459    

DOI:10.1080/01621459.1950.10483337

出版商:Taylor & Francis Group    

年代:1950

数据来源: Taylor

摘要:

A technique is presented for the treatment of errors introduced into sampling surveys due to the non-availability of respondents. The expected cost and variance of the sample survey are expressed as functions of sample size and of the number of call-backs made on the non-availables. A method is then presented which optimizes precision for a given cost by playing sampling error against the bias resulting from non-availables.

ISSN:0162-1459    

DOI:10.1080/01621459.1950.10483338

出版商:Taylor & Francis Group    

年代:1950

数据来源: Taylor

ISSN:0162-1459    

DOI:10.1080/01621459.1950.10483339

出版商:Taylor & Francis Group    

年代:1950

数据来源: Taylor

摘要:

The basic problem considered was that of selecting one out of a number of proposed question forms in survey work. In the particular case, there were two apparent directions of bias. Questions were designed to represent each of these, and each question of the set was judged in relation to these and to each other. Thurstone scaling of judgments was used to indicate which question was judged to lie centrally with respect to the set. The method is applicable to further work on question construction.

ISSN:0162-1459    

DOI:10.1080/01621459.1950.10483340

出版商:Taylor & Francis Group    

年代:1950

数据来源: Taylor