1-20 of 796 Search Results for

Limit Cycle Period

Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Journal Article
Demography (1989) 26 (1): 99–115.
Published: 01 February 1989
..., concluded that "limit cycles oscillations have been occurring in U. S. births." This article disputes their conclusion, ascribing it to an inconsistency in detrending procedures. Furthermore, it corrects Lee's original conclusion by showing that his alternative period labor-force feedback model, estimated...
Journal Article
Demography (1972) 9 (1): 173–185.
Published: 01 February 1972
..., and labor force participa- tion for various educational subgroups of the Rhode Island population in various historical intervals. There are obvious limitations to the use of retrospective information, par- ticularly for periods in the distant past. Retrospective questions may be subject to significant...
Journal Article
Demography (1983) 20 (3): 285–298.
Published: 01 August 1983
... Oscillation Theoretical Population Biology Limit Cycle Period Stable Population Theory References Arthur W. B. ( 1981 ). Why A Population Converges to Stability . American Mathematical Monthly , 88 , 557 – 563 . 10.2307/2320504 Cohen J. E. ( 1976 ). Ergodicity of Age...
Journal Article
Demography (1973) 10 (4): 591–597.
Published: 01 November 1973
.... Though the sample is limited to Catholics, these data provide an opportunity to study longi- tudinally the effect on subsequent fer- tility of characteristics in 1965. Fertility over this period varied systematically with the additional number of children intended in 1965. In addition, this study has...
Journal Article
Demography (1992) 29 (1): 113–126.
Published: 01 February 1992
... are limited to these calendar periods. 3 Cycle and Calendar Year Table 1 shows the proportions of abortions reported in the three cycles of the NSFG. The calendar for the 1976 round covered the years 1973 through 1975; in this case, the comparison is limited to women who were married at the time...
Journal Article
Demography (1991) 28 (1): 101–117.
Published: 01 February 1991
....' Field teams reported developing good rapport with the respondents by the middle of the collection period. A short baseline questionnaire was administered at the first visit to obtain a limited amount of background information, including the couple's motivations regarding fertility. Women were asked...
Journal Article
Demography (1994) 31 (2): 321–346.
Published: 01 May 1994
... for a given conception, and PF be the probability of conception given at least one insemination in the fertile period. As in Wood and Weinstein's model, the probability of conception in a given cycle, Pc, can be written as 00 Pc = I Pr(cIN = n)Pr(N = n), n=O (1) where N is the number of coital acts during...
Journal Article
Demography (1977) 14 (1): 33–42.
Published: 01 February 1977
...). Second, our data are restricted to 1957-1968, so that we are observing incomplete life his- tories over a relatively short time period, and this limits the generalizability of our results. Thus, we have no way of knowing what intercohort differences were ob- served in the period before 1957. By con...
Journal Article
Demography (1974) 11 (2): 227–245.
Published: 01 May 1974
... LIFE CYCLE There are a large number of indi- cators which should probably be used to measure how the cost of setting up and maintaining a family varies over the life cycle. As space is limited, we will confine ourselves to a consideration of the Bureau of Labor Statistics (BLS) equivalence scale...
Journal Article
Demography (1974) 11 (4): 563–585.
Published: 01 November 1974
... analysis which treats population change endogenously. When cohort fertility depends on relative cohort size, or when period fertility depends on labor force size, fluctuations of forty or more years replace the traditional “echo” or generation-length cycle. Twentieth-century U. S. fertility change agrees...
Journal Article
Demography (1997) 34 (1): 67–81.
Published: 01 February 1997
... of the total life expectancy that are spent in each of these stages. These pro- portions change as life expectancy changes. In broadest terms, the economic life cycle of the average person begins with a period ofdependency as a child, in which a substantial amount is consumed, but little is produced...
Journal Article
Demography (2015) 52 (2): 667–703.
Published: 02 April 2015
...-period infanticide and abortion, it could, mutatis mutandis , be applied to other historical settings to look for the traces of contraception, abstinence, or postconception forms of family planning. For example, researchers have argued that deliberate abstinence played an important part in limiting...
FIGURES | View All (9)
Journal Article
Demography (2007) 44 (4): 705–728.
Published: 01 November 2007
... collected from 1976 to 1998, we limit our analysis to informa- tion collected in the 1990s (more than 85% of cycles are dated 1994, 1995, or 1996). The aim of our study is not to predict fecundability, but rather to study the connections between fecundability, season, and some biological and behavioral...
Journal Article
Demography (1973) 10 (1): 99–112.
Published: 01 February 1973
.... The anovulatory period is the interval from childbirth to start of the first fecundable month. It may include one or more an- ovulatory cycles. The period of amenor- rhea is the interval from childbirth to first menses, or what is the same, from childbirth to end of the first menstrual cycle (be it ovulatory...
Journal Article
Demography (1999) 36 (1): 77–91.
Published: 01 February 1999
... and disability. In part, Fries argued that recent mortality improvements are reaching the biologi- cal limits of life and that further improvements in the health of survivors will diminish the period of chronic health prob- lems, that is, the "compression of morbidity." Recasting Fries's argument in terms...
Journal Article
Demography (1970) 7 (1): 93–120.
Published: 01 February 1970
... repetitive cycle, age composition must also be repetitive with the same cycle length. Under these conditions annual births follow a path that is an exponential multiplied by a periodic time-function. If the time variation of fertility is a small amplitude sinusoidal oscillation, the periodic component...
Journal Article
Demography (1990) 27 (4): 639–652.
Published: 01 November 1990
... Quarterly/Health and Socieity , 62 , 475 – 519 . 10.2307/3349861 Wachter , K. , & Lee , R. D. ( 1987 ). American Limit Cycle Oscillations . Berkeley : University of California, Graduate Group in Demography . Wachter , M. L. ( 1975 ). A Time-Series Fertility Equation...
Journal Article
Demography (1972) 9 (4): 549–567.
Published: 01 November 1972
.... These input variables were tried on a life-table population dis- tributed by sex, age, and marital status (see Grabill, 1945, Table 2). After ten repetitions of the cycle, each consisting of ten two-year periods, the growth multipliers were found to stabi- lize themselves within the set limits (e.g., 0.00001...
Journal Article
Demography (2017) 54 (3): 933–959.
Published: 05 June 2017
... for combining full-time employment with raising children were limited. Childcare coverage for children under age 3 was less than 5 % for the entire period; and until 2005, there were relatively few places in full-time public day care for older children (Schober and Spieß 2015 ). However, the parental leave...
FIGURES | View All (5)
Includes: Supplementary data
Journal Article
Demography (1987) 24 (4): 443–465.
Published: 01 November 1987
... that laboratory populations tend to be more sensitive, and more prone to cycle, than do natural populations. 27 The figure shows variations in population size; variations in births or age distribution would be far more pronounced. Once these oscillations converge to the limit cycle, the period will be somewhat...