Accuracy of developing tooth length as an estimate of age in human skeletal remains: the deciduous dentition

Dental age assessments are widely used to estimate age of immature skeletal remains. Most methods have relied on fractional stages of tooth emergence and formation, particularly of the permanent dentition, for predicting the age of infants and very young children. In this study, the accuracy of regression equations of developing deciduous tooth length for age estimation (Liversidge et al.) is tested on a sample of 30 Portuguese subadult skeletons of known age at death. Overall the method shows high accuracy and the average difference between estimated and chronological age is between 0.20 and -0.14 years when using single teeth, and 0.06 years, when using all available teeth. However, there is a tendency for the deciduous molars to provide overestimates of chronological age. Results show that age estimates can be obtained within +/-0.10 years with a 95% confidence interval when several teeth are used. Overall between-tooth agreement in age estimates decreases with increasing age but there is less variability of estimates with more teeth contributing to overall mean age. One seemingly limitation of this method may be the fact that it was developed by combining the maxillary and mandibular teeth. The other is related to the accuracy with which radiographic tooth length can be used as a valid surrogate for actual tooth length. Nevertheless, the advantages of this metric method surpass the limitations of chronologies based on stages of dental development.     

Tri-allelic SNP markers enable analysis of mixed and degraded DNA samples

For the analysis of degraded DNA in disaster victim identification (DVI) and criminal investigations, single nucleotide polymorphisms (SNPs) have been recognized as promising markers mainly because they can be analyzed in short sized amplicons. Most SNPs are bi-allelic and are thereby ineffective to detect mixtures, which may lead to incorrect genotyping. We developed an algorithm to find non-binary (i.e. tri-allelic or tetra-allelic) SNPs in the NCBI dbSNP database. We selected 31 potential tri-allelic SNPs with a minor allele frequency of at least 10%. The tri-allelic nature was confirmed for 15 SNPs residing on 14 different chromosomes. Multiplex SNaPshot™ assays were developed, and the allele frequencies of 16 SNPs were determined among 153 Dutch and 111 Netherlands Antilles reference samples. Using these multiplex SNP assays, the presence of a mixture of two DNA samples in a ratio up to 1:8 could be recognized reliably. Furthermore, we compared the genotyping efficiency of the tri-allelic SNP markers and short tandem repeat (STR) markers by analyzing artificially degraded DNA and DNA from 30 approximately 500-year-old bone and molar samples. In both types of degraded DNA samples, the larger sized STR amplicons failed to amplify whereas the tri-allelic SNP markers still provided valuable information. In conclusion, tri-allelic SNP markers are suited for the analysis of degraded DNA and enable the detection of a second DNA source in a sample.     

Measurement bias in self-reports of offending: a systematic review of experiments

Journal of Experimental Criminology - Self-reported offending is one of the primary measurement methods in criminology. In this article, we aimed to systematically review the experimental evidence...     

Presidents and cabinets: The political determinants of fiscal behavior in Latin America

What political factors drive fiscal behavior in Latin America’s persidential democracies? This work seeks to identify the political determinants of the level of public spending and the primary balance of ten democratic regimes in Latin America between 1980 and 1998. We consider, besides the influence of traditional variables such as the government’s ideological orientation and electoral cycle, the impact of other institutional and political aspects, such as the legislative strength of the president, ministerial stability, and the degree of centralization of budget institutions. Methodologically, the work is based on a pooled cross-section-time-series data analysis of 132 observations. Our main findings are that presidents supported by a strong party and leading a stable team of ministers—and ones more to the right on the political spectrum—had a negative impact on public spending and a positive effect on fiscal balance, and that the electoral cycle deteriorates the latter.     

Traditional Excluding Forces: A Review of the Quantitative Literature on the Economic Situation of Indigenous Peoples,Afro‐descendants,and People Living with Disability

Unequal income distribution in Latin America and the Caribbean is linked to unequal distributions of human and physical assets and differential access to markets and services. These circumstances, and the accompanying social tensions, need to be understood in terms of traditional fragmenting forces; the sectors of the population that experience unfavorable outcomes are also recognized by characteristics such as ethnicity, race, gender, and physical disability. In addition to reviewing the general literature on social exclusion, this article surveys several more specific topics: relative deprivation (in land and housing, physical infrastructure, health and income); labor market issues, including access to labor markets in general, as well as informality, segregation, and discrimination; the transaction points of political representation, social protection, and violence; and areas in which analysis remains weak and avenues for further research in the region.     

Economic Growth and Convergence in Latin America

Little is known about the convergence process among developing countries in general and in Latin America in particular. For the period as a whole there is no evidence of a narrowing in the cross-country dispersion of income (sigma convergence). But there is evidence of convergence to different steady state income levels at a speed that is common to all countries (conditional beta convergence). The article also shows that the estimates of convergence are sensitive to the way in which GDP per capita is measured.     

Field experiments on dishonesty and stealing: what have we learned in the last 40 years?

Journal of Experimental Criminology - Field experiments combine the benefits of the experimental method and the study of human behavior in real-life settings, providing high internal and external...