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Biomedical subjects

N Y Luther

Publications and source records attributed to N Y Luther.

11 recordsLinked to original sources
PubMed1995

Consistent correction of data for aboriginal populations.

"A consistent correction procedure is used to determine improved, consistent estimates by sex of census age distributions, intercensal births, intercensal deaths and net migration by age for the Aboriginal populations of the Northern Territory, South Australia and Western Australia during the period 1986-91. Undercount estimates and life tables show the Aboriginal populations to have lower coverage in statistical collections and much higher death risks than the total Australian population. Inter-regional net migration estimates show that component of change can no longer be ignored."

Age Distribution↗
PubMed1988

Consistent correction of census and vital registration data.

A new procedure is developed for simultaneously and consistently correcting 2 or more censuses and intercensal registered births and deaths. The procedure begins with a set of preliminary correction factors, which are not necessarily consistent. It then uses the mathematics of finite-dimensional vector spaces to derive an optimal set of final consistent correction factors. The optimization procedure is based on the principle that there exists in a hyperplane a unique point of minimum distance from a fixed point not in the hyperplane. For purposes of illustration, the procedure is applied to the censuses of 1970, 1975, and 1980 and intercensal registered births and deaths for the periods 1970-1975 and 1975-1980 for the Republic of Korea.

Asia↗
PubMed1982

A simple linearization procedure for local fit of the Weibull survival distribution: a note on an article by Choe.

The author comments on an article by Choe concerning the use of the Weibull survival function to fit curves to infant and childhood mortality data. "As an alternative to the computer program [employed by Choe], this note gives a simple linearization procedure that is easily executed by hand calculator. This procedure allows one to check the fit of the Weibull curve locally...for a range of ages (e.g. those from which one wishes to extrapolate). It also provides a simple way to find the Weibull curve parameters of optimum local fit." The procedure is illustrated using data for the period 1970-1971 for males and females in Taiwan.

Demography↗
PubMedDate not supplied

Are fertility differentials by education converging in the United States?

"According to the theory of demographic transition, fertility differentials by education tend to become strongly negative in the early stages of transition, because family limitation tends to catch on first among the more educated. As the transition proceeds, contraceptive use diffuses to the less educated, and fertility differentials by education eventually tend to reconverge. The question addressed here is: Do fertility differentials by education disappear or become positive in advanced industrial societies? Evidence presented in this paper indicates that in the United States they do not. As late as 1990, the latest year that we consider, fertility differentials by education were still strongly negative." (SUMMARY IN ITA AND FRE)

Americas↗