The spatial structure of population subgroups is important for many reasons. Information on the spatial concentrations of people in particular groups may be used for guiding government policy and is central to understanding issues such as differential access to resources. In addition, any geographical analysis of populations is partly a function of the spatial scale of variation of subgroups of...

The problem of hypothesis testing about proportions in two Ž nite populationsis addressed.The usual test based on the normal approximation (Z test) and a test based on estimatedp values (E test) are considered. The exact properties of the tests are evaluated numerically. Numerical studies indicate that the E test is very satisfactory even for small samples and can be recommended for practical u...

Detecting structure in population genetics and case-control studies is important, as it exposes phenomena such as ecoclines, admixture and stratification. Principal Component Analysis (PCA) is a linear dimension-reduction technique commonly used for this purpose, but it struggles to reveal complex, nonlinear data patterns. In this paper we introduce non-centred Minimum Curvilinear Embedding (nc...

While many Asian emerging markets now run current account surpluses, reducing Asia’s overall excess savings is largely about modifying growth patterns and saving–investment balances in China. China accounts for about half of the total GDP in Asia ex-Japan but over two-thirds of the region’s total savings and current account surplus. One feature shared by all Asian economies is the surge in corp...

1 We wish to thank Gabriel Lang for his helpful comments. 2 Corresponding author, AgroParisTech ENGREF, UMR EcoFoG, BP 316, 97310 Kourou, French Guyana. E-Mail: [email protected] 3 LET (Université de Lyon, CNRS, ENTPE), Institut des Sciences de l’Homme, 14 av. Berthelot, 69363 Lyon Cedex 07, France. E-Mail: [email protected] Abstract: In spatial statistics, Ripley’s K func...

In coupled networks, the properties of the constituent elements (cells), their interactions, and the coupling architecture combine to determine the possible coherent states that may arise. In this work, we examine what can be said about the coupling architecture of a network based on an observed polysynchronous activity pattern, in which cells form multiple synchronized clusters. Specifically, ...

Demographic data are commonly represented by using a choropleth map, which aggregates the data to arbitrary areal units, causing inaccuracies associated with spatial analysis and distribution. In contrast, dasymetric mapping takes quantitative areal data and attempts to show the underlying statistical surface by breaking up the areal units into zones of relative homogeneity. This thesis applies...

Models of nutrient-plankton interaction with a toxic substance that inhibits either the growth rate of phytoplankton, zooplankton or both populations are proposed and studied. For simplicity, it is assumed that both nutrient and the toxin have the same constant input and washout rate. The effects of toxin upon the existence, magnitude, and stability of the steady states are examined. Numerical ...

Local health departments (LHDs) can more effectively develop and strengthen community health partnerships when leaders focus on building partnership collaborative capacity (PCC), including a multisector infrastructure for population health improvement. Using the 2008 National Association of County and City Health Officials (NACCHO) Profile survey, we constructed an overall measure of LHD PCC co...

Tamarisk (Tamarix spp., saltcedar) is a well-known invasive phreatophyte introduced from Asia to North America in the 1800s. This report compares the efficacy of Landsat 5 Thematic Mapper (TM5), QuickBird (QB) and EO-1 Hyperion data in discriminating tamarisk populations near De Beque, Colorado, USA. As a result of highly correlated reflectance among the spectral bands provided by each sensor, ...