College Football Games and Crime

There is a great deal of anecdotal evidence that college football games can lead to aggressive and destructive behavior by fans. However, to date, no empirical study has attempted to document the magnitude of this phenomenon. We match daily data on offenses from the NIBRS to 26 Division I-A college football programs in order to estimate the relationship between college football games and crime. Our results suggest that the host community registers sharp increases in assaults, vandalism, arrests for disorderly conduct, and arrests for alcohol-related offenses on game days. Upsets are associated with the largest increases in the number of expected offenses. These estimates are discussed in the context of psychological theories of fan aggression

The Effect of Prenatal Stress on Birth Weight: Evidence from the al-Aqsa Intifada

No previous study has attempted to estimate the effect of intrauterine exposure to armed conflict, a potential source of stress, on pregnancy outcomes. Drawing on data from the 2004 Palestinian Demographic and Health Survey, we examine the relationship between fatalities caused by Israeli security forces (a measure of conflict intensity) and birth weight. Our estimates suggest that first-trimester fatalities are positively related to the probability that a child weighed less than 2,500 grams at birth. This result is consistent with medical studies showing a strong negative correlation between self-reported stress during the first trimester of pregnancy and birth weight.birth weight, prenatal stress, Israeli-Palestinian conflict

The Effect of Prenatal Stress on Birth Weight: Evidence from the al-Aqsa Intifada

No previous study has attempted to estimate the effect of intrauterine exposure to armed conflict, a potential source of stress, on pregnancy outcomes. Drawing on data from the 2004 Palestinian Demographic and Health Survey, we examine the relationship between fatalities caused by Israeli security forces (a measure of conflict intensity) and birth weight. Our estimates suggest that first-trimester fatalities are positively related to the probability that a child weighed less than 2,500 grams at birth. This result is consistent with medical studies showing a strong negative correlation between self-reported stress during the first trimester of pregnancy and birth weight.Birth weight, prenatal stress, Israeli-Palestinian conflict

Microquasars: disk-jet coupling in stellar-mass black holes

Microquasars provide new insights into: 1) the physics of relativistic jets from black holes, 2) the connection between accretion and ejection, and 3) the physical mechanisms in the formation of stellar-mass black holes. Furthermore, the studies of microquasars in our Galaxy can provide in the future new insights on: 1) a large fraction of the ultraluminous X-ray sources in nearby galaxies, 2) gamma-ray bursts (GRBs) of long duration in distant galaxies, and 3) the physics in the jets of blazars. If jets in GRBs, microquasars and Active Galactic Nuclei (AGN) are due to a unique universal magnetohydrodynamic mechanism, synergy of the research on these three different classes of cosmic objects will lead to further progress in black hole physics and astrophysics.Comment: 4 pages, 3 figures. To appear in Proceedings of IAU Symp. No 238 "Black Holes: from Stars to Galaxies - across the Range of Masses. Held in Prague, August 21-25, 2006. Eds. V. Karas & G. Mat

Medical Marijuana Laws, Traffic Fatalities, and Alcohol Consumption

To date, 16 states have passed medical marijuana laws, yet very little is known about their effects. Using state-level data, we examine the relationship between medical marijuana laws and a variety of outcomes. Legalization of medical marijuana is associated with increased use of marijuana among adults, but not among minors. In addition, legalization is associated with a nearly 9 percent decrease in traffic fatalities, most likely to due to its impact on alcohol consumption. Our estimates provide strong evidence that marijuana and alcohol are substitutes.medical marijuana, traffic fatalities, alcohol consumption

The Kid's Speech: The Effect of Stuttering on Human Capital Acquisition

A number of studies have shown that childhood speech impairments such as stuttering are associated with lower test scores and educational attainment. However, it is unclear whether this result is causal in nature or whether it can be explained by difficult-to-measure heterogeneity at the community, family, or individual level. Using data from the National Longitudinal Study of Adolescent Health and ordinary least squares, we show that stuttering is negatively associated with high school grades, the probability of high school graduation, and the probability of college attendance. However, empirical specifications with family fixed effects or controls for learning disabilities such as Attention Deficit Hyperactivity Disorder suggest that these associations can, in large part, be explained by difficult-to-measure heterogeneity.speech impairment, stuttering, human capital, educational attainment

Minimum fuel control of a pitch motion of a satellite in circular orbit

Time function analysis for optimal control of satellite attitude and control jet fuel consumption in circular orbit

Economic Conditions, Deterrence and Juvenile Crime: Evidence from Micro Data

This is the first paper to test the economic model of crime for juveniles using micro data. It uses a nationally representative sample of 16,478 high school children surveyed in 1995. The sample includes not only detailed information on offenses, but also data on personal, family and neighborhood characteristics as well as deterrence measures. We analyze the determinants of selling drugs, committing assault, robbery, burglary and theft, separately for males and females. We find that an increase in violent crime arrests reduces the probability of selling drugs and assaulting someone for males, and reduces the probability of selling drugs and stealing for females. An increase in local unemployment increases the propensity to commit crimes, as does local poverty. Similarly, family poverty increases the probability to commit robbery, burglary and theft for males, and assault and burglary for females. Local characteristics are more important for females than males. The results also indicate that family supervision has an impact on delinquent behavior. These results show that juveniles do respond to incentives and sanctions as predicted by economic theory. Employment opportunities, increased family income and more strict deterrence are effective tools to reduce juvenile crime.

Cigarette Taxes and the Social Market

Previous researchers have argued that the social market for cigarettes insulates its participants from policies designed to curb youth smoking. Using state Youth Risk Behavior Survey data, we examine whether recent changes in state cigarette taxes affected how young smokers obtained their cigarettes. Our estimates suggest that tax increases reduce youth smoking participation primarily through their effect on third-party purchase, although there is evidence that they are negatively related to borrowing among younger teenagers and negatively related to direct purchase among older teenagers.youth smoking, cigarette taxes

High on Life? Medical Marijuana Laws and Suicide

Using state-level data for the period 1990 through 2007, we estimate the effect of legalizing medical marijuana on suicide rates. Our results suggest that the passage of a medical marijuana law is associated with an almost 5 percent reduction in the total suicide rate, an 11 percent reduction in the suicide rate of 20- through 29-year-old males, and a 9 percent reduction in the suicide rate of 30- through 39-year-old males. Estimates of the relationship between legalization and female suicides are less precise and are sensitive to functional form.medical marijuana laws, marijuana, alcohol, suicide