...Carl P. Schmertmann Abstract Censuses and surveys frequently collect information on period fertility through questions on the timing of last births. The standard approach to estimating fertility with open-interval data uses the proportion of women giving birth in the year before the interview. I...

... obtener los momentos de los intervalos abiertos del caso general. ab]Summary Summary The open birth interval has been defined as the interval of time since the last live birth to the date of survey for a woman married and in the reproductive age group at the time of the survey. Some empirical studies have...

...Donald W. Hastings; Walter W. Robinson Abstract Using the 1970 1/1,000 Public Use Sample of the U.S. population, the relationships of the closed and open birth intervals with parity and mother’s age, with parity and marital duration and with children ever born/marital duration and mother’s age...

...K. Srinivasan Abstract A correlation analysis of data on four fertility variables viz. closed birth interval, open birth interval, age and parity, collected in a survey of about 2,000 married women in the reproductive ages in rural India, is carried out in order to study the interrelationships...

... the data source is a cross-sectional survey, the length of open interval is inherently different for real and for synthetic cohorts, it is strongly related to reproductive intention, and that affects the classification of exposure to risk in the open interval. 7 1 2011 © Population Association...

...Ronald R. Rindfuss; Larry L. Bumpass; James A. Palmore Abstract The practice of collecting information on only the last closed and the open birth intervals results in a biased set of intervals. Given this bias, can analysis of these intervals provide unbiased estimates of the effects...

... employed length of the open birth interval. In an illustrative analysis of World Fertility Survey data from sub-Saharan Africa, sterility was found to be high in Cameroon, intermediate in Lesotho and Sudan, and low in Ghana and Kenya relative to an English historical population. 30 12 2010 ©...

... intervals may be anticipated to increase open intervals and thereby lower the age at last birth. The effect is demonstrated in Figure I. The parity-specific mean birth intervals for women with both 6 and 8 children ever born from the 1860 birth cohort of once-married women in Utah (Anderton and Bean, 1985...

... and mortality. These, therefore, are not directly applicable to interregional “open” systems in which migration is frequently a much more variable and important contributor to population change than births or deaths. However, a natural extension of the demographer's matrix model allows one to incorporate place...

... constructed, each a ratio of time I to time 2 measures: (a) percent using PAC; (b) percent having open intervals longer than two years; (c) average length of open interval; (d) percent having unwanted births in the three years prior to the inter- view; (e) unwanted births per 100 woman years of exposure...

... of her pregnancies, if any, and the open interval (the one terminated by interview). First it was determined whether the couple had employed any method of birth con- 435 436 DEMOGRAPHY, volume 6, number4, November 1969 trol during the interval. For those re- porting no method, we asked: IIWas the only...

... Fertility: A Trend Report and Bibliography . Oxford, England : Basil Blackwell . Leridon Henri ( 1967 ). Les Intervalles Entre Naissances: Nouvelles Donnees d’Observation . Population: Revue Bimestrielle , 22 , 821 – 840 . Potter Robert G. ( 1963 ). Birth Intervals: Structure...

... to be analyzed are a mix- ture of closed intervals (that is, intervals terminated by a birth) and open intervals (that is, intervals ended by the interview rather than by a birth). This combination of closed and open intervals presents ana- lyticaldifficulties, unless the schedulegov- erning the completion...

... by five-year age groups, up to the open-ended, highest age interval. Thus the equations in the previous sec- tion need to be modified in order to apply this method to the data, and form of which, that are usually available. From equation (2) it is straightforward to derive N(a) = N(a + 5)exp[5sra...

... in the second interval. Then q' = liE. That provides us with M = E[I + K(E - 2E - K). For those with an open first interval, the problem is to deter- mine the waiting time until marriage, i.e., Ilq". Since M = 1/(1 - pip") and E = II q', we have Ilq" = M(E - IE - M). The assumptions required 'for this esti...

... the birth of their last child. While most of these women have completed their families, eight percent indicate that they "definitely or probably" expect more children. Those expecting more children are generally younger and have rela- tively short open intervals-one third are currently pregnant...

... for the Melbourne sample, the problem of open birth intervals must be ad- dressed. If all women with open birth intervals were older and had lived for decades without closing an interval, the problem could be dismissed. In fact, however, many respondents had open birth intervals simply because the event beginning...

... of increased education are shown, and so forth. The methodolo- gy differs from that of Akin et al., who used reported durations of breastfeeding in the closed and open birth intervals to 683 construct their dependent variable, as against the proportion of children in a specific age cohort who were being...

... is the dependent variable in a functional relationship. The second problem is that the dura- tion of breast-feeding is truncated (a) in the closed birth interval by the birth of another child, or (b) in the open birth in- terval by the date of the interview. What this means statistically is that the depen- dent...

... is not a good indicator of the initiation of risk to a first birth is emphasized by the increas- ing proportion of Korean first births in the first nine months of marriage (Rind- fuss et al., 1982). I "Open" Interval: The Censoring Problem In addition to the selectivity issues discussed above, the use of cross...