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At least 217 records · Page 12Linked to original sources
PubMed1984

Competing risk analysis for life table data with known observation times.

"Several models have been proposed for the analysis of cohort mortality in the presence of competing risks.... This paper describes a maximum likelihood approach to the analysis of follow up data in life table format for the case of two competing risks--a specific cause and its competing complement. The model developed uses a robust survivorship assumption--the piecewise exponential--and takes into account information on time to death and time to withdrawal." (summary in GER)

Cause of Death↗
PubMedDate not supplied

Life-table methods for contraceptive research.

Life-table methods used for the analysis and interpretation of contraceptive follow-up studies differ from those used in other areas of medical research. The historical development of these methods in the contraceptive literature is outlined and the two main methods are discussed, compared and shown to differ mainly in their nomenclature; their results are very similar in practice. The daily life-table method is simpler to apply and interpret, and facilitates analysis using the logrank statistic as well as powerful regression modelling techniques for survival data.

Actuarial Analysis↗
PubMed1986

The rate of convergence of a generalized stable population.

In an age-structured population that grows exponentially, each age group pi(t) at period t is asymptotically equivalent to x0t for some positive number x0. In this paper we show that the speed at which the ith age group reaches its exponential state of equilibrium can be measured by the rate at which the ratio vi(t) = pi(t)/pi(t-1) converges to x0. The age specific rate of convergence is determined by considering a quantity r satisfying [vi(t)-x0] less than or equal to rt when t is large; Ri = Inf r (over all initial populations, r satisfying the above inequality) is the R-factor used in numerical analysis to measure the rate at which the sequence vi(t) converges to x0; Si = -1n Ri is then defined as the rate of convergence to stability of the ith age group. The case of constant net maternity rates is studied in detail; in this context S0 is compared to the population entropy H, which was proposed by Tuljapurkar (1982) as a measure of the rate of convergence to stability.

Age Factors↗
PubMed1987

Serum lipids in Norplant implants users: a cross-sectional study.

One of the methods to establish the safety and risk profile of hormonal contraceptives is employing a study on their metabolic effects. In order to evaluate the effect of Norplant implants on serum lipids, a cross-sectional study was undertaken at Klinik Raden Saleh, Jakarta. The subjects recruited were divided into 8 groups depending on the length of Norplant use, i.e. before insertion, 6 months, 12 months, 24 months, 36 months, 48 months, 60 months and one week after the removal of Norplant. Blood samples were collected from the subjects after an overnight fast. The parameters studied were triglycerides, total cholesterol, HDL-cholesterol and LDL-cholesterol. There were no significant differences between the groups regarding the triglycerides and HDL-cholesterol (p greater than 0.05). There were significant differences between the groups regarding the total cholesterol and LDL-cholesterol (p less than 0.01).

Adult↗
PubMed1983

Measuring the costs of children: an alternative approach.

Problems related to the concept of the "cost of a child", more commonly known as the general equivalence scale, are reviewed. The importance of this concept is noted with regard to both theoretical and empirical studies relating to taxation, poverty, income distribution, dietary needs, income maintenance programs, supplementary and child benefits, and other social security payments. "This paper proposes a new methodology for calculating the scale using a framework which is consistent with utility theory and which overcomes the identification problem without having to enforce the arbitrary prior assumptions of recent studies. The proposed method allows easy calculation of not only the basic 'scale' parameter but also how it varies with price and reference utility. [The author illustrates] the usefulness of the procedure by estimating on U.K. budget data at two different levels of aggregation and employing two sets of quite different functional forms. The results are plausible, compare favourably with one another and, hence, confirm the robustness and usefulness of the proposed procedure."

Adolescent↗
PubMed1983

Forecasting metropolitan and urban subregional population changes and their resource use implications: methodology and example--Sydney, Australia.

This paper is concerned with the methodology of forecasting population change and structures of large cities and their major subregions. "The model isolates quantifiable base populations and their growth, and international, inter-state and city-hinterland migration streams and the national increase attributable to each, and intra-urban mobility, as components of growth and change." The model is applied to data for Sydney, Australia, and its applicability to other urban systems is considered.

Australia↗
PubMed1982

The rural-urban population balance again.

"This paper explores further the economics of the rural-urban population balance, using the method of comparative statics. It confirms the results obtained by Artle and his colleagues, using the method of excess demand analysis, thus demonstrating that the two methods of analysis are equivalent in this context. In analysing the effects of non-neutral technological change upon urbanization, it is essential to distinguish between the total elasticity of demand for manufactured products, and the income and (compensated) price elasticities, respectively. The empirical plausibility is questioned of assuming that total demand for the aggregate of manufactured goods is elastic."

Costs and Cost Analysis↗
PubMed1983

Clomiphene citrate therapy for luteal phase defect.

The incidence of luteal phase defects in 366 infertility patients was 12.7%. Life-table analysis was used for determination of the conception rate with clomiphene citrate therapy, and with this method, evidence was found for the presence of two subgroups with respect to response. The crude conception rate was 40.9%. In a group of patients with a luteal phase defect and no other infertility factors, those that conceived had a significantly larger mean biopsy delay than those who did not (6.28 days versus 4.32; P less than 0.02). In a group with a histologic delay of 5 days or more, the conception rate was 79%, while the rate was only 8.9% in those with a less severe deficit (P less than 0.001). Theoretic considerations for clomiphene citrate therapy are discussed.

Actuarial Analysis↗