Published in Journal of population economics
"This paper presents a critical evaluation of three widely used tests for sex preferences: sex ratio, parity progression ratio and ordinary least squares [OLS] regression of birth interval. We show that under some appropriate conditions, the sex ratio is a valid test for sex preferences. The methods of parity progression ratio and OLS regression of...
Published in Maandstatistiek van de bevolking (Hague, Netherlands : 1982)
Two methods for adjusting data on birth expectations derived from fertility surveys for use in population forecasts are presented. The two methods, the relational Gompertz model and the partial adjustment model, are applied to data from the 1985 Netherlands Fertility Survey. The implications for forecasting future trends in fertility are then discu...
Published in Wiadomości statystyczne (Warsaw, Poland : 1956)
The antilogistic function and method of simple substitution (deduced from projecting trends in technological development) are applied to the analysis of the demographic transition using data concerning Poland and Sweden from the eighteenth century to the present.
Published in Environment & planning A
The authors challenge the conclusion stated in a recent article by J. O'Loughlin that economic factors only marginally influence migration from the European periphery to the industrial centers of Western and Northern Europe. A reply by O'Loughlin is included (pp. 1,125-7).
Published in American journal of obstetrics and gynecology
Researchers measured the bone densities of the lumbar spine and the femoral neck using dual-photon densitometry in 352 normal women (range: 21 to 79 years old) in order to study the relationship between the bone densities and parity, breast feeding, and the use of oral contraceptives (OCs). Since the most common manifestations of osteoporosis, a bo...
Published in Ceskoslovenská gynekologie
Dilapan (DTD) rods of 4 mm diameter and 65 mm length made with polymetric polyacrylonitrile by the Swiss Robapharm firm were used in 42 women 5-8 weeks pregnant and in 27 women 8-12 weeks pregnant for cervical dilatation prior to miniabortion and conventional abortion,respectively. In addition, they were also used in 10 women with advanced pregnanc...
Published in Jinko mondai kenkyu. [Journal of population problems]
"In this paper, we critically prove the formulas of Ledent-Rogers-Willekens.... Our procedure does not depend on multi-regional life table technique but on direct discretization of the continuous-time model. Here our main purpose is not to provide new results but to clear the conditions under which these methods for estimating the parameters can be...
Published in Jinko mondai kenkyu. [Journal of population problems]
The author evaluates methods of estimating the probability of dying with the elimination of specific causes of death.
Published in Fertility and sterility
The world literature on manipulations purported to alter the gender of offspring is a quagmire full of reports presenting inadequate data and contradictory conclusions. Many are due to inappropriate statistical design or analysis. The authors present simple, nontechnical reference tables for determination of the minimum sample size necessary to det...
Published in Cancer genetics and cytogenetics
Researchers observed the incidence of sister chromatid exchange (SCE) in the lymphocyte chromosomes of 129 healthy adult females. They did this to learn the effect of chewing betel leaf, a carcinogenic substance which is widely chewed in India, on pregnant women and women using oral contraceptives (OCs). The 1st group of 71 nonchewers consisted of ...
