Skip to main content

January 10, 2018

From Harper's:
Humans’ ability to make random choices peaks at age twenty-five.

From The Economist:
In America education and marriage go hand-in-hand, to the extent that marriage rates are now higher among women with PhDs than among women with bachelor’s degrees.

From The Economist:
At the age of 45, the average university-educated American man has led a fairly straightforward personal life. Fully 88% of such men have married, and three-quarters of those are still married to their first wives. Men who did not finish high school are less likely to have married and, if they have, more likely to have divorced ...

From Journal of Abnormal Child Psychology:
Animal experiments and cross-sectional human studies have linked particulate matter (PM) with increased behavioral problems. We conducted a longitudinal study to examine whether the trajectories of delinquent behavior are affected by PM2.5 (PM with aerodynamic diameter ≤ 2.5 μm) exposures before and during adolescence. We used the parent-reported Child Behavior Checklist at age 9–18 with repeated measures every ~2–3 years (up to 4 behavioral assessments) on 682 children from the Risk Factors for Antisocial Behavior Study conducted in a multi-ethnic cohort of twins born in 1990–1995. Based on prospectively-collected residential addresses and a spatiotemporal model of ambient air concentrations in Southern California, monthly PM2.5 estimates were aggregated to represent long-term (1-, 2-, 3-year average) exposures preceding baseline and cumulative average exposure until the last assessment. Multilevel mixed-effects models were used to examine the association between PM2.5 exposure and individual trajectories of delinquent behavior, adjusting for within-family/within-individual correlations and potential confounders. We also examined whether psychosocial factors modified this association. The results sμggest that PM2.5 exposure at baseline and cumulative exposure during follow-up was significantly associated (p < 0.05) with increased delinquent behavior. The estimated effect sizes (per interquartile increase of PM2.5 by 3.12–5.18 μg/m3) were equivalent to the difference in delinquency scores between adolescents who are 3.5–4 years apart in age. The adverse effect was stronger in families with unfavorable parent-to-child relationships, increased parental stress or maternal depressive symptoms. Overall, these findings sμggest long-term PM2.5 exposure may increase delinquent behavior of urban-dwelling adolescents, with the resulting neurotoxic effect aggravated by psychosocial adversities.

From Social Science & Medicine:
The present study showed that gaining access to guns at home was significantly related to increased depressive symptoms among children of gun owners, even after accounting for both observed and unobserved individual characteristics. Both fixed-effects and propensity-score matching models yielded consistent results. In addition, the observed association between in-home firearm access and depression was more pronounced for female adolescents. Finally, this study found suggestive evidence that the perceptions of safety, especially about school (but not neighborhood), are an important mechanism linking in-home firearm access to adolescent depression.

Comments

Post a Comment

Popular posts from this blog

February 24, 2018

From The New York Times : We are willing to pay a premium for convenience, of course — more than we often realize we are willing to pay. During the late 1990s, for example, technologies of music distribution like Napster made it possible to get music online at no cost, and lots of people availed themselves of the option. But though it remains easy to get music free, no one really does it anymore. Why? Because the introduction of the iTunes store in 2003 made buying music even more convenient than illegally downloading it. Convenient beat out free. As task after task becomes easier, the growing expectation of convenience exerts a pressure on everything else to be easy or get left behind. We are spoiled by immediacy and become annoyed by tasks that remain at the old level of effort and time. When you can skip the line and buy concert tickets on your phone, waiting in line to vote in an election is irritating. This is especially true for those who have never had to wait in lines (whic...
Post a Comment
Read more

February 26, 2018

From The Economist : An equity is a claim on the assets and the profits of a firm; a bond entitles the investor to a series of interest payments and repayment on maturity. Bitcoin brings no cashflows to the owner; the only return will come via a rise in price. When there is no obvious way of valuing an asset, it is hard to say that one target price is less likely than another. Bitcoin could be worth $10 or $100,000. One argument made by bitcoinnoisseurs is that it is a type of “digital gold”. Stores of value are supposed to keep their value; bitcoin, by contrast, is extremely volatile. Its code ensures that no more than 21m coins can ever be created; that sets bitcoin apart from fiat money, which central banks can create at will. Yet being limited in supply is a necessary, but not sufficient, condition for having value; signed photographs of Economist journalists are rare but, sadly, of negligible worth. Nor is supply really limited. Plenty of other cryptocurrencies exist. If the...
Post a Comment
Read more

February 27, 2018

From The New York Times : [Steven] Pinker contends that we should not be nostalgic for the economy of the 1950s, when jobs were plentiful and unions strong. A third of American children lived in poverty. Sixty percent of seniors had incomes below $1,000 a year. Only half the population had any savings in the bank at all. Between 1979 and 2014, meanwhile, the percentage of poor Americans dropped to 20 percent from 24 percent. The percentage of lower-middle-class Americans dropped to 17 from 24. The percentage of Americans who were upper middle class (earning $100,000 to $350,000) shot upward to 30 percent from 13 percent. There’s a fair bit of social mobility. Half of all Americans wind up in the top 10 percent of earners at at least one point in their career. One in nine spend some time in the top 1 percent. Poverty has been transformed by falling prices and government support. “When poverty is defined in terms of what people consume rather than what they earn, we find that the...
Post a Comment
Read more