INTRODUCTION A geostatistical approach to characterize MS-lesion patterns based on their geometrical properties is presented. METHODS A dataset of 259 binary MS-lesion masks in MNI space was subjected to directional variography. A model function was fit to express the observed spatial variability in x, y, z directions by the geostatistical parameters Range and Sill. RESULTS Parameters Range...

Spatial dependence exists when the variation between observations is dependent on spatial location. In the present study, geostatistical methods were used to examine spatial dependence in adolescents’ perceptions of their neighborhoods: whether adolescents living in close proximity perceived their neighborhoods more similarly than adolescents living further apart. Participants included 343 adol...

This study examines whether sell-side equity analysts engage in “social learning” which their earnings forecasts for certain firms are influenced by the and outcomes of “peer” associated with other respective portfolios. We find that analyst optimism is negatively correlated recent forecast errors, peers, on analyst's portfolio. An also more likely to issue “bold” when peers recently issued sim...

We consider the problem of model selection for geospatial data. Spatial correlation is often ignored in the selection of explanatory variables, and this can influence model selection results. For example, the importance of particular explanatory variables may not be apparent when spatial correlation is ignored. To address this problem, we consider the Akaike Information Criterion (AIC) as appli...

[1] We investigate, through numerical experiments, the viability of three-dimensional transient hydraulic tomography (3DTHT) for identifying the spatial distribution of groundwater flow parameters (primarily, hydraulic conductivity K) in permeable, unconfined aquifers. To invert the large amount of transient data collected from 3DTHT surveys, we utilize an iterative geostatistical inversion str...

We examine whether analyst independence contributes to analysts’ monitoring role in deterring accruals earnings management. first report a negative association between management and the ratio of independent analysts brokerage covering firm. Next, through lens promotion sell-side research institutions by 2003 Global Research Analyst Settlement, we document significant decrease on firms affected...