Replication Studies of Development Impact Evaluations

Six years ago, the International Initiative for Impact Evaluation (3ie) launched a programme to promote and fund replication studies of impact evaluations in international development. We designed the programme with the objective of improving the quality of evidence for development policy-making, using replication research to both validate the results of published impact evaluations and build the incentives for more transparent and high quality research going forward. The programme’s focus is internal replication, which uses the original data from a study to address the same question as that study. This Journal of Development Studies special issue compiles the majority of completed 3ie-funded replication studies initiated in the first years of the programme. In all cases the pure replication components of these studies are generally able to reproduce the results published in the original article. Most of the measurement and estimation analyses confirm the robustness of the original articles or call into question just a subset of the original findings. These replication studies mostly focus on providing additional information about the impacts of the interventions – especially additional information that can be important for interpreting the articles for the purpose of policy-making.     

Evaluation of the Education Sector Enhancement Program in Barbados

ABSTRACT

Drawing on the education production function literature, we examine the short-run impact of comprehensive education reforms in Barbados on primary school student outcomes. Using a variety of specifications to test the robustness of our results, we find modest and mixed changes in student test scores. Our findings are discussed in the context of management challenges that resulted from the need to coordinate a multi-faceted project in a rapidly developing nation; alignment of goals and schedules of two multi-national development banks, the Ministry of Education, Youth Affairs and Sports (MES), and the Government of Barbados; and, a very rapidly changing information technology environment that led, in part, to changes in planned capital improvements in schools, equipment needs, and had implications for teacher training.     

Mandibular ramus: an indicator for sex in fragmentary mandible

Mandible is the hardest and most durable bone of the skull exhibiting a high degree of sexual dimorphism. Especially ramus of mandible is subjected to greater stress than any other bone of the skull because of the process of mastication. This study has been performed to establish the osteometric standards for practical use in forensic context over Indian population using mandibular ramus. The sample consists of 116 mandibles of Northern Indian population (M:F; 92:24, mean age 37.4 years), collected from the Department of Forensic Medicine, IMS, BHU, Varanasi. Osteometric informations about five metric parameters (coronoid height, projective height, condylar height, and maximum breadth and minimum breadth of ramus) were taken with sliding calipers. These parameters were subjected to different discriminant function analysis using SPSS 16.0. All parameters showed significant sexual dimorphism (p < 0.001 in all cases) with an overall accuracy of 80.2%, and coronoid height was the single best parameter providing an accuracy of 74.1%.     

Typing of mitochondrial DNA from isolated cells of the human buccal epithelium

The authors have developed a method for molecular-genetic analysis of DNA from isolated cells for the purpose of forensic medical diagnostics. The method is based on the use of the laser capture microdissection (LCM) technology in combination with typing of mitochondrial DNA. Optimization of the conditions for amplification of polymorphic mtDNA loci in preparations containing minimal amounts of the genetic material was accomplished at the initial stage of the work. To this effect, the two-round polymerase chain reaction was employed that allowed the amplified material to be accumulated in the amount sufficient for sequenation. At the next stages, the system thus obtained was tested on the cell model (using isolated cells of human buccal epithelium). It was shown that the proposed method is suitable for the analysis of specific mtDNA characteristics in a single human cell.     

Tissue distribution of tetramethylthiuram disulfide in warm-blooded animals

The objective of the present work was to study the distribution of tetramethylthiuram disulfide (TMTD) in the body of warm-blooded animals as exemplified by white rats. TMTD was administered intragastrically and detected in the unaltered form in other internal organs. It was found to accumulate in the largest amounts in the gastric contents, kidneys, and urine.     

The development of a test-system for the quantitative and qualitative evaluation of DNA content in criminalistic objects by the real-time polymerase chain reaction

An original test-system for the preliminary quantitative and qualitative evaluation of isolated DNA is proposed by the polymerase chain reaction in real time (PCR-RT) based on the TaqMan technology. This test-system permits to simultaneously measure the amount of DNA in the sample, identify the genetic gender, and detect PCR inhibitors. The method has been approbated in the practical work of forensic medical experts.     

Skeletal identification by radiographic comparison: blind tests of a morphoscopic method using antemortem chest radiographs

This study investigated the value of antemortem (AM) and postmortem (PM) radiographs of the claviculae and C3-T4 vertebrae to identify skeletons of missing U.S. soldiers from past military operations. In total, 12 field-recovered skeletons and AM chest radiographs of 1460 individuals were used. For each skeleton, examiners analyzed an array of AM chest radiographs (up to 1000 individuals) and attempted to identify the correct PM/AM radiographic match. When examiners were able to compare all images within a single test, only true-positive identifications were made. When AM radiographs were presented one-at-a-time, in sequential order, and without examiners having knowledge of array size, erroneous identifications resulted but they were almost exclusively made by untrained examiners (accuracy = 35% vs. 90% for trained examiners). This study demonstrates the value of chest radiographs for the identification of disarticulated and even eroded skeletons, but only when methods are wielded by trained examiners.