“The Young Ones are the Condom Generation”: Condom Use amongst Out-of-School Adolescents in Rural Southwest Uganda

This article reports on factors influencing condom use among out-of-school adolescents in rural southwest Uganda. Despite an abundance of negative discourses and myths about condoms in the community, these adolescents believe condoms protect them from sexually transmitted infections, HIV, and premarital pregnancies. Girls want partners to use condoms, but most lack the confidence to insist. Girls aged 13 to 14 reported the least difficulty asking for condoms; older girls attributed this to coming-of-age in the era of AIDS when condom use is the norm. Boys under 16 years want to use condoms, but lack confidence in application skills. Boys over 17 years always use condoms with casual partners, but only occasionally for pregnancy prevention with steady partners. Girls need skills training to improve confidence in negotiating condom use. Younger boys require training to improve confidence in skills with condom application. These findings are compared with studies conducted with in-school adolescents in the same study area. Health promotions that provide this skills training and focus on the need to think of the health of future family would be most effective for out-of-school adolescents. This study shows that it is self-confidence, rather than years of schooling, that has the greatest impact on condom use in this cohort.     

The impact of attitudes and behavioral costs on environmental behavior: A natural experiment on household waste recycling

Numerous studies have shown the importance of incentives as well as of attitudes in explaining pro-environmental behavior. Reported attitude effects, however, are generally rather small and exhibit considerable variation among studies. Different theoretical perspectives can account for this finding: whereas theories of rational action suggest additive effects of costs and attitudes, the low-cost hypothesis and dual-process theories imply interaction effects - in different directions, resulting from different mechanisms. The present study tries to overcome the shortcomings of past research by using advanced statistical methods to test competitive hypotheses in the context of post-consumer waste recycling. We utilize data from a natural experiment on recycling participation in Cologne/Germany (n = 1882) in which the incentive structure for recycling changed due to the conversion of the recycling scheme from a drop-off system to curbside collection. In order to avoid self-selection bias, we conducted pre- and post-treatment surveys and applied conditional fixed-effects regression models. We found that curbside collection had a strong impact on recycling participation and attitudes had a moderate effect. The interaction is negative but statistically insignificant. Our findings contradict the low-cost hypothesis and provide some evidence that environmental concerns moderate the effect of the recycling scheme. We cannot, however, reject the rational choice proposition of mere additive effects.     

The Other‐Race Effect in a Longitudinal Sample of 3‐, 6‐ and 9‐Month‐Old Infants: Evidence of a Training Effect

We investigated the development of the other‐race effect “ORE” in a longitudinal sample of 3‐, 6‐, and 9‐month‐old Caucasian infants. Previous research using cross‐sectional samples has shown an unstable ORE at 3 months, an increase at 6 months and full development at 9 months. In Experiment 1, we tested whether 9‐month‐olds showed the ORE with Caucasian and African faces. As expected, the 9‐month‐olds discriminated faces within their own ethnicity (Caucasian) but not within the unfamiliar ethnicity (African). In months. In Experiment 2, we longitudinally tested infants at 3, 6, and 9 months by presenting either the Caucasian or the African faces used in Experiment 1. In contrast to previous cross‐sectional studies and Experiment 1, we found that infants discriminated between all stimuli. Hence, we did not find the ORE in this longitudinal study even at 9 months. We assume that the infants in our longitudinal study showed no ORE because of previous repetitive exposure to African faces at 3 and 6 months. We argue that only a few presentations of faces from other ethnic categories sufficiently slow the development of the ORE.     

On difference-based variance estimation in nonparametric regression when the covariate is high dimensional

Summary.  We consider the problem of estimating the noise variance in homoscedastic nonparametric regression models. For low dimensional covariates t  ∈  R ^d ,  d =1, 2, difference-based estimators have been investigated in a series of papers. For a given length of such an estimator, difference schemes which minimize the asymptotic mean-squared error can be computed for d =1 and d =2. However, from numerical studies it is known that for finite sample sizes the performance of these estimators may be deficient owing to a large finite sample bias. We provide theoretical support for these findings. In particular, we show that with increasing dimension d this becomes more drastic. If d 4, these estimators even fail to be consistent. A different class of estimators is discussed which allow better control of the bias and remain consistent when d 4. These estimators are compared numerically with kernel-type estimators (which are asymptotically efficient), and some guidance is given about when their use becomes necessary.     

流动性过剩的测度方法研究

 当前,流动性过剩问题成为中国经济乃至全球经济的一个重要特征，但是在查阅有关文献的同时，我们发现，对于流动性过剩的测度方法缺乏一定的研究。针对这种状况，欧洲中央银行的有关专家提出了四种测度流动性过剩的方法，分别是价格缺口法（price gap,或者称p*法）、真实货币缺口法（real money gap）、名义货币缺口法（nominal money gap）和货币过剩法（money overhang）。我们将这四种方法翻译出来，供大家了解和研究时使用。文章翻译自Thorsten Polleit 和 Dieter Gerdesmeier的《流动性过剩的测度方法》一文，个别部分进行了删节。     

THE GENERALIZED ALCHIAN–ALLEN THEOREM: A SLUTSKY EQUATION FOR RELATIVE DEMAND

We generalize the Alchian–Allen theorem so as to account for income and endowment effects and provide two versions of a Generalized Alchian–Allen theorem: one for a unit cost component and one for a proportional cost component. Both versions provide a decomposition of an uncompensated change in the demand ratio of two goods into a substitution effect and an income‐endowment effect—and may thus be regarded as extensions of the familiar Slutsky equation for relative demand. Finally, we apply our results to the choice of real estates and to parental time allocation decisions, the latter providing implications for child care policies. (JEL D11, H21, J22, R21)     

An Evaluation of a Parenting Payment Intervention Program

This paper analyses the effect of a pilot program to assist single parent claimants to lessen their dependence on social security benefits. A sample of about 5000 persons was randomly assigned to one control and two treatment groups. Those in the treatment groups were asked to attend an initial interview to help them plan for the future and were then referred to other forms of assistance that might help them to realise their plans. Using different estimators and several indicators of outcomes, the evidence for the program having a positive effect on outcomes is very weak. The reason for this result is explored by an analysis of the relationships between the plans participants formulated, the barriers they faced and whether they left benefits. It is found that while the program encouraged claimants to plan for moving into paid work, the assistance offered did not reduce the barriers they faced.