Cost‐Effectiveness of Early Childhood Interventions to Enhance Preschool: Evidence from a Randomized Experiment in Head Start Centers Enrolling Historically Underserved Populations

We evaluate the cost‐effectiveness of two early childhood interventions that use instructional coaching and parent coaching as levers for improvement. The study design allows us to compare the individual effects of each intervention as well as their combined effect on student outcomes. We find that teachers receiving instructional coaching improve their use of evidence‐based instructional practices, while families receiving parent coaching show increases in numerous responsive parenting behaviors associated with positive child outcomes. Both interventions demonstrate positive impacts on students, but only parent coaching shows statistically significant effects across a range of student outcomes. Instructional coaching alone is substantially less costly and may therefore be the most cost‐effective of the three treatment conditions; however, small sample sizes limit our ability to reach definitive conclusions. Policy simulations suggest that implementing these interventions could raise the overall cost‐effectiveness of Head Start by at least 16 percent.     

Stampede to judgement: persuasive influence and herding behavior by courts

We model appeals courts as Bayesian decision makers with privateinformation about a supreme court's interpretation of the law;each court also observes the previous decisions of other appealscourts in similar cases. Such 'persuasive influence' can cause'herding' behavior by later appeals courts as decisions progressivelyrely more on previous decisions and less on a court's privateinformation. We provide an example drawn from a recent UnitedStates Supreme Court decision finding unconstitutional a basicprovision of a law previously found constitutional by six circuitcourts. Herding on the wrong decision may remain uncorrected,since review of harmonious decisions is rare.     

Less conflict,more peace? Understanding trends in conflict persistence

Persistent civil wars constitute a serious challenge to human security and have received growing attention in recent years. Yet our understanding of patterns of conflict persistence suffers from both the absence of clear definitions and measurements as well as a lack of attention to changes over time. As a result, the prevailing image of conflict persistence as an increasing threat does not adequately reflect reality. This in turn limits our ability to identify factors that favour or prevent persistence. The paper will highlight largely overlooked developments in intrastate conflict persistence over the last decades, showing that new conflicts appear to be shorter than before, while long duration and high recurrence rates are predominantly found in relatively small and peripheral conflicts. I argue that the major drivers of these patterns include changes in the nature and context of civil wars since the end of the Cold War, as well as changes in state capacity. The relationship between state capacity and conflict persistence, however, is ambivalent, and in some cases state strength appears to be a permissive factor of conflict persistence.     

The value of skull-photo superimpositions in identifying corpses found in domestic settings

The identification of decomposed corpses found in domestic settings is frequently problematic because comparative material for methods such as forensic odontostomatology, comparative X-ray analysis, or DNA analysis, is not available. In the case presented here, a photograph from an old, expired passport could be used to successfully identify a "domestic setting" corpse in a skull-photo superimposition. In an additional DNA analysis, 13 STR-loci could be amplified from tissue samples taken from the corpse. DNA comparison with the presumed brother of the deceased yielded a probability of 97.09% for siblingship. Y-STR-analysis was, therefore, performed. The results showed that all of the systems for the presumed brother and the corpse conformed, with the exception of the DYS390 locus, in which allele 21 was found for the corpse and allele 22 for the brother. Despite the rapid development of other identification procedures, skull-photo superimpositions remain an important means of identification. Last not least this is due to the increasing ubiquity of personal photo documents in the age of digital photography. The validity of the results from a DNA analysis in an identification process depends largely on the authenticity of the samples available for comparison and the degree to which the DNA from the corpse is preserved. In the case presented by the authors, positive identification of the corpse solely on the basis of the DNA analysis would not have been possible. Numerous constellations can be imagined for decomposed corpses found in domestic settings for which skull-photo superimpositions may be the only possible option for identifying the corpse.     

Criteria for the classification as a "domestic-setting corpse"--a literature search and review to define the term

In German medical and media circles (daily routine, specialist literature, press, novels), the term "domestic-setting corpse" is frequently used, but the term is only vaguely defined. The authors thus decided to perform an in-depth study of the literature, including historic textbooks and all German- and English-language medicolegal journals, going as far back as their first issues, in an attempt to more clearly define the term. Inclusion criteria used in the search were a post-mortem interval of at least 24 hours prior to discovery and discovery of the corpse in a domestic setting. In the literature, 37 cases that complied with the above-mentioned inclusion criteria were found. These cases frequently described "advanced decomposition", often "unclear cause of death" and "problems in identification". These characteristics can thus be considered as being additional pointers in the definition. However, we suggest that the two general defining characteristics of a "domestic-setting corpse" are a post-mortem interval of more than 24 hours before discovery and the discovery of the corpse in a domestic setting.