Between Large-N and Small-N Analyses: Historical Comparison of Thirty Insurgency Case Studies

Abstract

The authors study the 30 insurgencies occurring between 1978 and 2008 using four methods crossing the qualitative/quantitative divide. The four approaches are narrative, bivariate comparison, comparative qualitative analysis, and K-medoids clustering. The quantification of qualitative data allows the authors to compare more cases than they could “hold in their heads” under a traditional small-n qualitative approach, improving the quality of the overall narrative and helping to ensure that the quantitative analyses respected the nuance of the detailed case histories. Structured data-mining reduces the dimensionality of possible explanatory factors relative to the available observations to expose patterns in the data in ways more common in large-n studies. The four analytic approaches produced similar and mutually supporting findings, leading to robust conclusions.     

Qualitative Methods for the Study of Policy Diffusion: Challenges and Available Solutions

This article deals with the question whether and how processes of policy diffusion can be examined with qualitative methods. More specifically, how can qualitative methods address the “twin challenge of interdependence,” namely the challenge to identify diffusion, on the one hand, and the challenge to discriminate between mechanisms of diffusion, on the other? I argue, first, that there are three distinct qualitative techniques that can be used, namely cross‐case analysis (often based on systematic case selection), within‐case process tracing, and counterfactual reasoning. I demonstrate how these techniques can be adapted to the study of policy diffusion. Second, a combination of these methods is the best practice, since they are largely complementary in terms of the twin challenge of diffusion. The discussion draws on numerous illustrations from recent qualitative policy diffusion studies. The article closes with some suggestions for further methodological development in the study of policy diffusion, including the combination of quantitative and qualitative methods.     

Lidar mapping and surface survey of the Izapa state on the tropical piedmont of Chiapas,Mexico

Recent lidar and pedestrian surface surveys have remapped the well-known Mesoamerican site of Izapa and the surrounding Soconusco piedmont. These data document: 1) occupation from the surrounding piedmont environment, 2) significantly larger estimates of the site's size during both the Formative and Classic periods as well as 3) new architectural features from the monumental site core. Methodological issues are outlined for combining high precision lidar mapping with ground truthing and pedestrian survey that focuses on surface collection of temporally diagnostic artifacts. Results are presented for 670 mounds documented in an area of 43.1 sq km in and around the ancient capital of Izapa.     

A test of Suchey–Brooks (pubic symphysis) and Buckberry–Chamberlain (auricular surface) methods on an identified Spanish sample: paleodemographic implications

Forensic Anthropology and Bioarchaeology studies depend critically on the accuracy and reliability of age-estimation techniques. In this study we have evaluated two age-estimation methods for adults based on the pubic symphysis (Suchey–Brooks) and the auricular surface (Buckberry–Chamberlain) in a current sample of 139 individuals (67 women and 72 men) from Madrid in order to verify the accuracy of both methods applied to a sample of innominate bones from the central Iberian Peninsula. Based on the overall results of this study, the Buckberry–Chamberlain method seems to be the method that provides better estimates in terms of accuracy (percentage of hits) and absolute difference to the chronological age taking into account the total sample. The percentage of hits and mean absolute difference of the Buckberry–Chamberlain and Suchey–Brooks methods are 97.3% and 11.24 years, and 85.7% and 14.38 years, respectively. However, this apparently greater applicability of the Buckberry–Chamberlain method is mainly due to the broad age ranges provided. Results indicated that Suchey–Brooks method is more appropriate for populations with a majority of young individuals, whereas Buckberry–Chamberlain method is recommended for populations with a higher percentage of individuals in the range 60–70 years. These different age estimation methodologies significantly influence the resulting demographic profile, consequently affecting the biological characteristics reconstruction of the samples in which they are applied.     

Henry Pelham's Lost Grand Jury Map of Kerry (c.1800): A Newly Found Derivative

The ‘South Division of the County of Kerry’ (GSI FS 1.2.001) is a copy of the southern half of a lost late eighteenth / early nineteenth century map of County Kerry, in southwestern Ireland. Geological annotations on the map are traced to specific episodes (c.1820, 1838 and 1844) in the unofficial geological survey of Ireland conducted by Richard (later Sir Richard) Griffith between 1811 and 1855. The Griffith provenance of the map is part of the evidence used to identify the ‘South Division of the County of Kerry’ as a derivative of the now lost Grand Jury map of Kerry made by the American émigré artist and cartographer Henry Pelham.     

W. W. deLacy's 1865 map of the territory of Montana

Abstract

The Topographical Survey of the Orange Free State, executed by the British War Office between 1905 and 1911, was not only one of the first but also one of the finest topographical surveys to be undertaken in British colonial Africa. The motivation for this undertaking stemmed from three sources: the personal interest of Sir David Gill (H.M. Astronomer at the Cape) in the measurement of the arc of the 30th meridian; Britain's imperialistic intervention in South Africa which resulted in the South African War (1899–1902) against the Boer Republics and which stressed the need for reliable military maps for warfare as well as for the general defence of the new colonies; and the need for accurate maps for purposes of colonial administration and land tenure. The survey took five and a half years to complete, and the 1: 125,000 series (G.S.G.S. 2230) that was compiled represented the only accurate maps of this part of the continent for almost seven decades.     

The American Geographical Society's Map of Hispanic America: Million-Scale Mapping between the Wars

ABSTRACT

The 1:1 million Map of Hispanic America, compiled at the American Geographical Society's New York headquarters between the First and Second World Wars, has been seen as a landmark in twentieth-century cartography. In this essay we re-evaluate the Hispanic Map as a technical and scholarly project and re-assess its wider significance for the history of twentieth-century topographic mapping in the light of the cultural and political factors that shaped its development. When finally completed in 1945, the Hispanic Map was rightly judged an unsurpassed scientific achievement and a major work of art. But it was already out of date, superseded by newer cartographic technologies, particularly aerial survey and reconnaissance, that had removed the need for the kind of meticulous and painstaking compilation that the Hispanic Map exemplified.     

SLIDING MODE CONTROL OF BUILDING FRAMES UNDER RANDOM GROUND MOTION

A sliding mode control theory is presented to control the response of building frames to predominant frequency components of the random ground motions. The control algorithm is derived based on a sliding surface which is a function of a state vector containing the structural displacements and velocities and variables that dictate the predominant frequency components of the excitation. Three control mechanisms are employed to control the response of the building frame namely, (1) active mass damper (AMD) placed at the top storey of the building, (2) an actuator placed at a storey level and, (3) an actuator placed at a storey level along with a tuned mass damper (TMD) situated at the top storey level. Responses obtained by the proposed control strategy are compared with those obtained by the linear feedback and feedforward-feedback control strategies (conventional control strategies). Also, they are compared with those obtained by the sliding mode control strategy that considers in its state vector only structural displacements and velocities. It is shown that the proposed control strategy generally performs better than other control strategies in the higher range of control forces. For the lower range of control forces, conventional control strategies are more effective.     

OBTAINING PROBABILISTIC ESTIMATES OF DISPLACEMENT ON A LANDSLIDE DURING FUTURE EARTHQUAKES

The assessment of earthquake triggered landslide hazard may be undertaken using both deterministic and probabilistic techniques. Probabilistic methods have been developed because much of the data can be considered as random variables where parameters such as the angle of internal friction and moisture content do not have a single fixed value but may assume any number of values across a range. This random variability can be modelled by a probability density function (PDF) which describes the relative likeli-hood that a random variable will assume a particular value. Instead of using just the average or expected value of an input parameter, the complete range of possible values can be used to estimate a range of possible outcomes. Thus the probability of a slope being unstable can be obtained rather than a single indicator of stability. Such proba-bilistic analyses allow for the incorporation of the likely variability of each parameter and therefore allow a more intimate assessment of slope stability to be derived. Utilising empirical relationships for calculating earthquake ground motions and associated slope displacement, an investigation was undertaken to identify the contribution that modern simulation techniques could make to the assessment of earthquake-triggered landslides. To achieve this, geotechnical and earthquake data obtained from a deep-seated landslide triggered during the M _w 7.0 Loma Prieta earthquake was used. By incorporating the variability of the geotechnical parameters and the uncertainty in earthquake location the model derived the probabilities associated with increasing amounts of slope displacement during future probable earthquakes. Analysis was undertaken for four of the principal fault segments in the San Francisco Bay area. These estimates were then combined with the occurrence probabilities of the earthquakes to provide temporal estimates of dis-placement for a 30 year period. Results indicated that a M _w 7.0 earthquake located on the Peninsula Segment of the San Andreas fault was most hazardous with a 11% chance of minor slope displacement (≥0.10 m) and a 6% chance of moderate slope displacement (≥0.30 m) within the next 30 years.     

黑河流域居民生活质量研究

以《Calvert-Henderson生活质量指标》一书为理论指导构建了生活质量评价指标体系,通过开展生活质量问卷调查及查找相关统计资料,运用主成分分析法确定指标的权重,研究了我国西北地区第二大内陆河流域-黑河流域城乡居民2004年的生活质量。具体的评价结果是:黑河流域城镇居民生活质量明显高于农村;黑河流域城市居民生活质量表现出中游高于上游和下游;黑河流域农村居民生活质量以乡镇为单位计算差异显著;黑河流域农村居民生活质量中游略好于上游、下游;影响黑河流域城乡居民生活质量的主要因素是收入、教育和住房。