Shripad Tuljapurkar
Dados Biográficos
| ID | 126994 |
|---|---|
| NOME | Shripad Tuljapurkar |
| PRENOMES | Shripad |
| SOBRENOME | Tuljapurkar |
| ASSINATURA | TULJAPURKAR S |
| AFILIAÇÕES | Stanford University |
| ORCID | 0000-0001-5549-4245 |
| VERIFICADO | Sim |
| TOTAL DE OBRAS | 20 |
| TOTAL DE CITAÇÕES | 165 |
| TOTAL COMO AUTOR | 18 |
| TOTAL COMO EDITOR | 2 |
| PRIMEIRO ANO DE PUBLICAÇÃO | 1991 |
| ANO MAIS RECENTE DE PUBLICAÇÃO | 2026 |
| ÍNDICE H | 6 |
The Interaction of Racial-Ethnic and Economic Concentration and its Association with Premature Mortality in U.S. Neighborhoods
Changing Demographic Rates Reshape Kinship Networks
The number and age of kin determine the companionship and support individuals provide or receive. Over recent decades, fertility and mortality rates have changed considerably, with varying speeds across countries. We investigate the changes in kinship networks in response to time-varying demographic rates, with a focus on the speed of change. We start with stylized demographic trajectories to determine the separate effects of fertility and mortal…
How does the demographic transition affect kinship networks
Kinship groups can have considerable importance (e.g., generational support, inheritance, and information for key life events). During demographic transitions, kinship networks are reshaped by changes in mortality and fertility rates
Machine learning approaches to the social determinants of health in the health and retirement study
Some of the machine learning methods do not improve prediction or fit beyond simpler models, however, neural networks performed well. The predictors identified across models suggest underlying social factors that are important predictors of biological indicators of chronic disease, and that the non-linear and interactive relationships between variables fundamental to the neural network approach may be important to consider
Convergence in male and female life expectancy
The cornerstone of mortality- and life-expectancy forecasting in developed nations, the Lee-Carter model relies on assumptions of there being a dominant singular value that captures most of the variance within a matrix of age-specific mortality rates over
Population Cycles, Formal Theory of
Divergence in Age Patterns of Mortality Change Drives International Divergence in Lifespan Inequality
In the past six decades, lifespan inequality has varied greatly within and among countries even while life expectancy has continued to increase. How and why does mortality change generate this diversity? We derive a precise link between changes in age-specific mortality and lifespan inequality, measured as the variance of age at death. Key to this relationship is a young–old threshold age, below and above which mortality decline respectively decr…
Variance in death and its implications for modeling and forecasting mortality
Demography as the Human Story
Aging in Advanced Industrial States
How can economic schemes curtail the increasing sex ratio at birth in China
Fertility decline, driven by the one-child policy, and son preference have contributed to an alarming difference in the number of live male and female births in China. We present a quantitative model where people choose to sex-select because they perceive that married sons are more valuable than married daughters. Due to the predominant patrilocal kinship system in China, daughters-in-law provide valuable emotional and financial support, enhancin…
Risky Business
Population, Resources and Development
In the 21st century, the populations of the world’s nations will display large and long-lived changes in age structure. Many of these began with fertility change and are amplified by declining mortality and by migration within and between nations. Demography will matter in this century not by force of numbers, but by the pressures of waves of age structural change. Many developing countries are in relatively early stages of fertility decline and …
Inequality in Life Spans and a New Perspective on Mortality Convergence Across Industrialized Countries
The second half of the twentieth century witnessed substantial convergence in life expectancy around the world. We examine differences in the age pattern of mortality in industrialized countries over time to show that inequality in adult life spans, which we measure with the standard deviation of life table ages at death above age 10 years, S10, is increasingly responsible for the remaining divergence in mortality. We report striking differences …
Soils, Agriculture, and Society in Precontact Hawai`i
Before European contact, Hawai`i supported large human populations in complex societies that were based on multiple pathways of intensive agriculture. We show that soils within a long-abandoned 60-square-kilometer dryland agricultural complex are substantially richer in bases and phosphorus than are those just outside it, and that this enrichment predated the establishment of intensive agriculture. Climate and soil fertility combined to constrain…
A universal pattern of mortality decline in the G7 countries
Hanihara's Conundrum Revisited. Theoretical Estimates of the Immigration into Japan during the 1,000 Year Period from 300 B.C. to A.D. 700
Prehistoric Japanese population is believed to have increased from 75, 800 in 300 B.C. to 5, 399, 800 in A.D. 700-a 70-fold increase in 1, 000 years. The rate of natural increase-hereafter called the annual growth rate-likely averaged 0.1% during this period. A closed population growing at this rate would have experienced only a 2.7-fold increase, so that the deficit must have been balanced by immigration, and the question is how much? Hanihara (…
Population momentum for gradual demographic transitions
Population momentum is the ratio of a population's ultimate size after a demographic transition to its initial size before the transition. For an instantaneous drop to replacement fertility, Nathan Keyfitz found a simple expression M K for the momentum. However, as Keyfitz pointed out, `no one thinks that any country will drop immediately to stationary reproduction patterns'. We present results concerning the momentum of a population whose demogr…
Death and Taxes
We analyze in three steps the influence of the projected mortality decline on the long run finances of the Social Security System. First, on a theoretical level, mortality decline adds person years of life which are distributed across the life cycle. The interaction of this distribution with the age distribution of labor earnings minus consumption, or of taxes minus benefits, partially determines the corresponding steady state financial consequen…
Population Dynamics in Variable Environments
Inequality in Life Spans and a New Perspective on Mortality Convergence Across Industrialized Countries
The second half of the twentieth century witnessed substantial convergence in life expectancy around the world. We examine differences in the age pattern of mortality in industrialized countries over time to show that inequality in adult life spans, which we measure with the standard deviation of life table ages at death above age 10 years, S10, is increasingly responsible for the remaining divergence in mortality. We report striking differences …
Divergence in Age Patterns of Mortality Change Drives International Divergence in Lifespan Inequality
In the past six decades, lifespan inequality has varied greatly within and among countries even while life expectancy has continued to increase. How and why does mortality change generate this diversity? We derive a precise link between changes in age-specific mortality and lifespan inequality, measured as the variance of age at death. Key to this relationship is a young–old threshold age, below and above which mortality decline respectively decr…
Variance in death and its implications for modeling and forecasting mortality
Death and Taxes
We analyze in three steps the influence of the projected mortality decline on the long run finances of the Social Security System. First, on a theoretical level, mortality decline adds person years of life which are distributed across the life cycle. The interaction of this distribution with the age distribution of labor earnings minus consumption, or of taxes minus benefits, partially determines the corresponding steady state financial consequen…
Population momentum for gradual demographic transitions
Population momentum is the ratio of a population's ultimate size after a demographic transition to its initial size before the transition. For an instantaneous drop to replacement fertility, Nathan Keyfitz found a simple expression M K for the momentum. However, as Keyfitz pointed out, `no one thinks that any country will drop immediately to stationary reproduction patterns'. We present results concerning the momentum of a population whose demogr…
Risky Business
How does the demographic transition affect kinship networks
Kinship groups can have considerable importance (e.g., generational support, inheritance, and information for key life events). During demographic transitions, kinship networks are reshaped by changes in mortality and fertility rates
How can economic schemes curtail the increasing sex ratio at birth in China
Fertility decline, driven by the one-child policy, and son preference have contributed to an alarming difference in the number of live male and female births in China. We present a quantitative model where people choose to sex-select because they perceive that married sons are more valuable than married daughters. Due to the predominant patrilocal kinship system in China, daughters-in-law provide valuable emotional and financial support, enhancin…
Convergence in male and female life expectancy
The cornerstone of mortality- and life-expectancy forecasting in developed nations, the Lee-Carter model relies on assumptions of there being a dominant singular value that captures most of the variance within a matrix of age-specific mortality rates over
Population Dynamics in Variable Environments
Death and Taxes
We analyze in three steps the influence of the projected mortality decline on the long run finances of the Social Security System. First, on a theoretical level, mortality decline adds person years of life which are distributed across the life cycle. The interaction of this distribution with the age distribution of labor earnings minus consumption, or of taxes minus benefits, partially determines the corresponding steady state financial consequen…
Population momentum for gradual demographic transitions
Population momentum is the ratio of a population's ultimate size after a demographic transition to its initial size before the transition. For an instantaneous drop to replacement fertility, Nathan Keyfitz found a simple expression M K for the momentum. However, as Keyfitz pointed out, `no one thinks that any country will drop immediately to stationary reproduction patterns'. We present results concerning the momentum of a population whose demogr…
A universal pattern of mortality decline in the G7 countries
Hanihara's Conundrum Revisited. Theoretical Estimates of the Immigration into Japan during the 1,000 Year Period from 300 B.C. to A.D. 700
Prehistoric Japanese population is believed to have increased from 75, 800 in 300 B.C. to 5, 399, 800 in A.D. 700-a 70-fold increase in 1, 000 years. The rate of natural increase-hereafter called the annual growth rate-likely averaged 0.1% during this period. A closed population growing at this rate would have experienced only a 2.7-fold increase, so that the deficit must have been balanced by immigration, and the question is how much? Hanihara (…
Soils, Agriculture, and Society in Precontact Hawai`i
Before European contact, Hawai`i supported large human populations in complex societies that were based on multiple pathways of intensive agriculture. We show that soils within a long-abandoned 60-square-kilometer dryland agricultural complex are substantially richer in bases and phosphorus than are those just outside it, and that this enrichment predated the establishment of intensive agriculture. Climate and soil fertility combined to constrain…
Population, Resources and Development
In the 21st century, the populations of the world’s nations will display large and long-lived changes in age structure. Many of these began with fertility change and are amplified by declining mortality and by migration within and between nations. Demography will matter in this century not by force of numbers, but by the pressures of waves of age structural change. Many developing countries are in relatively early stages of fertility decline and …
Inequality in Life Spans and a New Perspective on Mortality Convergence Across Industrialized Countries
The second half of the twentieth century witnessed substantial convergence in life expectancy around the world. We examine differences in the age pattern of mortality in industrialized countries over time to show that inequality in adult life spans, which we measure with the standard deviation of life table ages at death above age 10 years, S10, is increasingly responsible for the remaining divergence in mortality. We report striking differences …
Risky Business
How can economic schemes curtail the increasing sex ratio at birth in China
Fertility decline, driven by the one-child policy, and son preference have contributed to an alarming difference in the number of live male and female births in China. We present a quantitative model where people choose to sex-select because they perceive that married sons are more valuable than married daughters. Due to the predominant patrilocal kinship system in China, daughters-in-law provide valuable emotional and financial support, enhancin…
Aging in Advanced Industrial States
Variance in death and its implications for modeling and forecasting mortality
Demography as the Human Story
Divergence in Age Patterns of Mortality Change Drives International Divergence in Lifespan Inequality
In the past six decades, lifespan inequality has varied greatly within and among countries even while life expectancy has continued to increase. How and why does mortality change generate this diversity? We derive a precise link between changes in age-specific mortality and lifespan inequality, measured as the variance of age at death. Key to this relationship is a young–old threshold age, below and above which mortality decline respectively decr…
Population Cycles, Formal Theory of
Convergence in male and female life expectancy
The cornerstone of mortality- and life-expectancy forecasting in developed nations, the Lee-Carter model relies on assumptions of there being a dominant singular value that captures most of the variance within a matrix of age-specific mortality rates over
Machine learning approaches to the social determinants of health in the health and retirement study
Some of the machine learning methods do not improve prediction or fit beyond simpler models, however, neural networks performed well. The predictors identified across models suggest underlying social factors that are important predictors of biological indicators of chronic disease, and that the non-linear and interactive relationships between variables fundamental to the neural network approach may be important to consider
How does the demographic transition affect kinship networks
Kinship groups can have considerable importance (e.g., generational support, inheritance, and information for key life events). During demographic transitions, kinship networks are reshaped by changes in mortality and fertility rates
Changing Demographic Rates Reshape Kinship Networks
The number and age of kin determine the companionship and support individuals provide or receive. Over recent decades, fertility and mortality rates have changed considerably, with varying speeds across countries. We investigate the changes in kinship networks in response to time-varying demographic rates, with a focus on the speed of change. We start with stylized demographic trajectories to determine the separate effects of fertility and mortal…
The Interaction of Racial-Ethnic and Economic Concentration and its Association with Premature Mortality in U.S. Neighborhoods
Population (16 obras) · Demography (15 obras) · Sociology (13 obras) · Economics (12 obras) · Demographic economics (9 obras) · Geography (8 obras) · Insurance, Mortality, Demography, Risk Management (8 obras) · Global Health Care Issues (7 obras) · Life expectancy (6 obras) · Demography (5 obras)