A Time-Series Analysis of Crime and Drug Use in New York City

This report summarizes the results of a project which investigated the time series interrelationships between crime, drug use, police, and arrests in New York City. We use monthly data from 1970 through 1990 for New York City. We plot the individual time series for five different non-drug crimes, arrest rates for these crimes, drug deaths, number of police officers, and drug arrests in New York City. We find that drug usage, as proxied by drug deaths, increased from the mid-1980's to about 1988-1989. At the same time, felony drug arrests increased substantially. During the mid-1980's, there were increases in murders, assaults, and motor vehicle thefts. Robberies increased in the later 1980s and burglaries declined throughout the 1980s. Arrest rates and total arrests for non-drug crimes did not decline during this period of increased drug arrests. In a multivariate analysis, we found that the three property crimes investigated - robberies, burglaries and motor vehicle thefts - increased when there were unexpected increases in drug usage. We did not find such a relationship between drug use and murders or assaults, holding constant arrest rates and police. In addition, we found evidence of police deterrence, either directly, or through arrests, of property-related and assault offenses, but not for murders. Thus, in a time-series approach, we are able to find a causal relationship between drug usage and property-related felonies.

Canister for Producing TMA Trails in the Upper Atmosphere

Payload canister for producing trimethyl aluminum trails in upper atmosphere using Nike-Cajun or Nike-Apache rocke

Energy Conversion Alternatives Study (ECAS), General Electric Phase 1. Volume 2: Advanced energy conversion systems. Part 1: Open-cycle gas turbines

Ten energy conversion systems are defined and analyzed in terms of efficiency. These include: open-cycle gas turbine recuperative; open-cycle gas turbine; closed-cycle gas turbine; supercritical CO2 cycle; advanced steam cycle; liquid metal topping cycle; open-cycle MHD; closed-cycle inert gas MHD; closed-cycle liquid metal MHD; and fuel cells. Results are presented

The Effects of Low Birthweight and Other Medical Risk Factors on Resource Utilization in the Pre-School Years

This study compares resource utilization of pre-school aged children who are at medical risk with their healthier pre-school aged peers. Medical risk is defined as having been born of low birthweight, having an activity limitation, having a chronic health condition, or having a handicapping condition. Resources include: child care, pre-school, kindergarten, Headstart programs, and medical resources. The study uses two distinct data sets. The first is the National Health Interview Survey's Child Health Supplement of 1988, with approximately 2,500 children aged 3 to 5. The second data set is the National Household Education Survey of 1991, which consisted of about 6,700 children who were aged 3 to 5. The study uses a multivariate analysis to explore differences between at-risk and healthier peers, holding constant a variety of social and economic factors. The study finds consistent results that at-risk pre-school aged children are more likely to become hospitalized and are less healthy than their healthier peers, holding constant social and economic factors. In addition, they are more likely to delay entry into kindergarten. There is no evidence for differences in amount or type of child care or in mother's labor force participation. There is some evidence that at-risk children consume more pre-school resources.

Effects of Child Health on Parents' Relationship Status

We use data from the national longitudinal Fragile Families and Child Wellbeing Study to estimate the effect of poor child health on father presence. We look at whether parents live in the same household 12-18 months after the child's birth and also at how their relationships changed along a continuum (married, cohabiting, romantically involved, friends, or not involved) during the same period. We find that having an infant in poor health reduces the likelihood that parents will live together and increases the likelihood that they will become less committed to their relationship, particularly among parents with low socioeconomic status.

Demographic Analysis of Birthweight-Specific Neonatal Mortality

This paper explores the determinants of birthweight-specific neonatal mortality rates across States in the U.S. in 1980. We are able to explore the interactions between the determinants and birthweight because of the new data available through the National Infant Mortality Surveillance (NIMS). The NIMS links birth and death certificates for each state, resulting in a data base with race-specific neonatal mortality rates by birthweight, and other characteristics. Using a reduced-form model, we find abortion and neonatal intensive care availability to be the most important determinants of overall neonatal mortality. For whites, the two factors are of approximately equal importance in determining neonatal mortality. For blacks, abortion availability has twice the impact of neonatal inexpensive care. Moreover, our results suggest that neonatal mortality rates could be lowered by policies that reduce the inequality in these health resources across states.

Women´s Return to Work after First Birth in Sweden during 1980-2000

The goal of this study is to investigate whether and how fast Swedish women returned to work after their first birth and what were the incentives and constraints for their decisions during the latest decades when Sweden was experiencing significant fluctuations both in its economy and in its level of fertility. The analysis is conducted at individual level based on a longitudinal data set from the latest two waves (1991 and 2000) of a long-time running panel survey of "The Swedish Level-of-Living survey" (LNU). We employ the methods of event-history analysis. The findings suggest Swedish women delayed their return to paid work after the first birth in the 1990s due mainly to the gradual extensions in the parental leave benefits in the 1990s, although the economic crisis in the 1990s might result in a faster return for young mothers. In addition to the strong influences of personal and family characteristics such as age at first birth, eligibility for parental leave and father's share of parental leave, whether a woman worked or not prior to the first birth strongly influences the outcomes of her after-birth labour force participation. The study seems to suggest convergences in the timing of return to work in terms of women’s education, the sector (public or private) of employment and the size of the company, but an enlarged gap between women with high job positions and the others.Return to work; first birth

Mothers' and Fathers' Labor Supply in Fragile Families: The Role of Child Health

We estimate the effect of poor child health on the labor supply of mothers and fathers post welfare reform, using a national sample of mostly unwed parents and their children-a group at high risk of living in poverty. We account for the potential endogeneity of child health and find that having a young child in poor health reduces the mother's probability of working, the mother's hours of work, and the father's hours of work. These results suggest that children's health problems may diminish their parents' capacity to invest in their health.

Mother's Labor Supply in Fragile Families: The Role of Child Health

A growing body of research indicates that low socioeconomic status in early childhood sets the stage for increasing disadvantages in both health and educational capital over the child's life course and can cause low socioeconomic status to persist for generations. The study estimated the effects of poor child health on the labor supply of mothers with one-year-old children using a national longitudinal data set that oversampled unmarried parents in the post welfare reform era. It was found that having a child in poor health reduces the mother's probability of working by eight percentage points and her hours of work by three per week when she is employed. Another important finding is that the father having children with another partner increases the mothers' labor supply, even after controlling for the focal child's health status and numerous other covariates.