摘要:

This paper reviews the development of demography, and especially of population forecasting, and discusses the current demographic situation. The merits and limitations of several methods of making population predictions, and errors in demographic thinking are examined. The complexity of the problem of making forecasts either for short periods or long-time trends with the techniques now available is pointed out.

ISSN:0162-1459    

DOI:10.1080/01621459.1950.10501127

出版商:Taylor & Francis Group    

年代:1950

数据来源: Taylor

摘要:

The demographic development of the population of the world is divided into the three regions of Incipient Decline, Transitional Growth, and High Growth Potential. For each of these, the factors of changing birth rates, death rates, and family size are considered in their relation to the changes taking place in the social structure and national economy of the countries included in each region.

ISSN:0162-1459    

DOI:10.1080/01621459.1950.10501128

出版商:Taylor & Francis Group    

年代:1950

数据来源: Taylor

ISSN:0162-1459    

DOI:10.1080/01621459.1950.10501129

出版商:Taylor & Francis Group    

年代:1950

数据来源: Taylor

摘要:

A sampling technique is defined as introducing control into the selection ofnout ofNsampling units when it increases the probabilities of selection for preferred combinations of units (and decreases the probabilities for non-preferred combinations). Methods used in the past have by no means exhausted the possibilities of controlled selection, however. Procedures are developed by which the probabilities of selection for preferred combinations are sharply increased and the theoretical basis for the methods is stated. The methods are applied to a specific problem and the procedures are described in detail. It it found that as a result the variances of estimates for several important items are reduced as compared with the corresponding variances for stratified random sampling.

ISSN:0162-1459    

DOI:10.1080/01621459.1950.10501130

出版商:Taylor & Francis Group    

年代:1950

数据来源: Taylor

摘要:

In interpreting rates of syphilis incidence, it is worthwhile to evaluate certain factors which influence the probability of acquiring syphilis. In the past, these factors have been estimated separately either by graphical or by elementary numerical methods. A model is proposed in the present paper to measure these factors simultaneously. The parameters in the model can be estimated by multiple regression and tested for statistical significance.

ISSN:0162-1459    

DOI:10.1080/01621459.1950.10501131

出版商:Taylor & Francis Group    

年代:1950

数据来源: Taylor

摘要:

Studies of labor-force participation have heretofore stressed the influence of earnings as a determinant of the proportion of the population that seeks employment. Low earnings are associated with high propensities to engage in the labor force. The variation in labor-force participation is greater among females than among males in the large cities of the United States. This study points out that high female labor-force participation rates are found in communities in which large numbers of jobs suitable for women are found in textile, apparel, tobacco, and electrical machinery manufacturing. Conversely, low labor-force participation among women is found in communities in which the dominant industries are iron and steel, machinery, automobile, and basic rubber manufacturing. It is the thesis of this paper that the availability of employment opportunities for women is a major factor in determining labor-force participation.

ISSN:0162-1459    

DOI:10.1080/01621459.1950.10501132

出版商:Taylor & Francis Group    

年代:1950

数据来源: Taylor

摘要:

The method of moments is employed with “single” truncated random samples; (1) to estimate the mean,μ, and the standard deviation, σ, of a Pearson Type III population when α3is known; and (2) to estimateμ, σ, and α3when only the form of the distribution is known in advance. No information is assumed to be available about the number of variates in the omitted portion of the sample. The results obtained can be readily applied to practical problems with the aid of “Salvosa's Tables of Pearson's Type III Function.” An illustrative example is included in the paper.

ISSN:0162-1459    

DOI:10.1080/01621459.1950.10501133

出版商:Taylor & Francis Group    

年代:1950

数据来源: Taylor

摘要:

Some efforts of the Bureau of the Census to measure and evaluate response errors are described. Particular attention is devoted to the October, 1948, pretest of Census procedures and the measurement of response errors of the various procedures. The procedures were: (1) Self-enumeration, using a household schedule. The schedule was a single sheet of paper 18″ × 24Prime; with 10 columns of questions for the various members of the household—two columns of questions for each individual repeated five times—on one side, and a letter to the household and questions on housing on the other side. (2) Self-enumeration using a 4 page booklet, the page size being 9Prime; × 11Prime;, with Individual Enumeration Forms (9Prime; × 11Prime;) inserted for each member of the household. The questions were printed front and back in two columns on the Individual Enumeration Form. (3) Obtaining information from respondents by direct interview. (4) Obtaining basic information by direct interview and leaving schedule with additional questions for respondent to fill out, the schedule to be picked up on a second visit to the household.

ISSN:0162-1459    

DOI:10.1080/01621459.1950.10501134

出版商:Taylor & Francis Group    

年代:1950

数据来源: Taylor

摘要:

This paper derives estimates of money income received by persons making less than $500 per annum for the years 1944–1948. The estimates are classified by source of income and are obtained by adjusting basic census data for various types of understatement.

ISSN:0162-1459    

DOI:10.1080/01621459.1950.10501135

出版商:Taylor & Francis Group    

年代:1950

数据来源: Taylor

摘要:

This paper presents a technique for computing the precision of two measuring instruments when there is a linear relation between the scales of the two instruments.

ISSN:0162-1459    

DOI:10.1080/01621459.1950.10501136

出版商:Taylor & Francis Group    

年代:1950

数据来源: Taylor