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Open Interval

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Journal Article
Demography (1999) 36 (4): 505–519.
Published: 01 November 1999
...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...
Journal Article
Demography (1968) 5 (1): 34–44.
Published: 01 March 1968
...K. Srinivasan 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 indicated the potential advantages of this interval...
Journal Article
Demography (1975) 12 (3): 455–466.
Published: 01 August 1975
...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...
Journal Article
Demography (1970) 7 (4): 401–410.
Published: 01 November 1970
...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...
Journal Article
Demography (1981) 18 (4): 487–509.
Published: 01 November 1981
... 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. References Ryder N. B. ( 1978...
Journal Article
Demography (1987) 24 (1): 113–122.
Published: 01 February 1987
...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...
Journal Article
Demography (1989) 26 (2): 185–201.
Published: 01 May 1989
... 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 ©...
Journal Article
Demography (1989) 26 (3): 467–470.
Published: 01 August 1989
... 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...
Journal Article
Demography (1966) 3 (2): 537–544.
Published: 01 June 1966
... 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...
Journal Article
Demography (1976) 13 (4): 463–478.
Published: 01 November 1976
... 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...
Journal Article
Demography (1969) 6 (4): 435–444.
Published: 01 November 1969
... 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...
Journal Article
Demography (1974) 11 (2): 207–214.
Published: 01 May 1974
... 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...
Journal Article
Demography (1978) 15 (1): 75–86.
Published: 01 February 1978
... 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...
Journal Article
Demography (1984) 21 (2): 217–233.
Published: 01 May 1984
... 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...
Journal Article
Demography (1978) 15 (4): 433–458.
Published: 01 November 1978
... 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...
Journal Article
Demography (1969) 6 (4): 445–454.
Published: 01 November 1969
... 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. On the other hand, women...
Journal Article
Demography (1984) 21 (4): 683–686.
Published: 01 November 1984
... 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...
Journal Article
Demography (1985) 22 (1): 61–72.
Published: 01 February 1985
... 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...
Journal Article
Demography (1981) 18 (3): 287–307.
Published: 01 August 1981
... 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...
Journal Article
Demography (1982) 19 (2): 241–260.
Published: 01 May 1982
... 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...