Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"K-function"”.
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Network dual K function: Exact statistical methods for analyzing co-location on street networks
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-08-01
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Spatial dependency between a linear network and a point pattern
… of point processes in the form of Ripley's K-function for unmarked point patterns and the cross-K function for marked point patterns. We then get to the main focus of this mini-dissertation, that is, the spatial relationship between points and linear structures, particularly linear networks. …
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Spatial Analysis of Fatal Automobile Crashes in Nashville, TN, 2001-2011
… including planar KDE, planar global auto K function, network global cross K functions, and network local cross K functions. All fatal crashes in the Nashville area were found to be clustered and generally follow the patterns of average daily traffic flow. All time-based subtypes of fatal …
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The Impact of a Planar Drainage Geocomposite in Unsaturated Soil
… characteristic curve (GWCC) and permeability function (K-function) were characterized in the lab experimentally. A modified Tempe pressure plate cell with a high-flow, low Air-Entry Value (AEV) porous ceramic was used to obtain GWCCs for several variations of geotextiles used in the DrainTube® …
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DESIGN AND IMPLEMENTATION OF A CO-LOCATION ANALYSIS TOOL
… to analyze collocation patterns: Ripley's K-function approach, and a novel approach called K-Nearest-Neighbor distance approach. Both approaches compute spatial statistics for different neighborhood sizes and compare these characteristics with spatial characteristics obtained by placing …
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Spatial Pattern Analysis of Tree Species Distribution in a Central Appalachian Upland Heath Barren
… pattern. The spatial statistics, Ripley's K-function and nearest neighbor analysis, presented a series of different interaction types reflected across size-growth classes and species where the null hypothesis was rejected for some pairs and supported in others. The selected biophysical …
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Seeing Prehistory through New Lenses: Using Geophysical and Statistical Analysis to Identify Fresh Perspectives of a 15th Century Mandan Occupation
… through point pattern analysis and Ripley’s K function amongst structures. Clustering of external storage pits also resulted from similar analysis, highlighting a connection between external storage features and the structures they surrounded. A combination of documented defensive features, a …
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Characterizing Crown Struture of Three Interior Northwest Conifer Species Using Terrestrial Laser Scanning
… was described using a 3-D form of the Ripley’s K function. Ripley’s K analysis detected maximum clustering occuring at scales of 1.25 – 2.50 percent of crown length (e.g., 25-50 cm radius clusters in a 20 meter crown). P. ponderosa demonstrated clustering over the largest range of scales and to …
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Characterizing Crown Struture of Three Interior Northwest Conifer Species Using Terrestrial Laser Scanning
… was described using a 3-D form of the Ripley’s K function. Ripley’s K analysis detected maximum clustering occuring at scales of 1.25 – 2.50 percent of crown length (e.g., 25-50 cm radius clusters in a 20 meter crown). P. ponderosa demonstrated clustering over the largest range of scales and to …
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Spatial Patterns and Correlates of Lower Respiratory Tract Illnesses in Children from Drakenstein, Western Cape
… cluster analysis was performed using Ripley's K function and Kullddorf spatial scan statistics. Finally, generalized additive models were used to identify socio-demographic factors associated with pneumonia and wheeze. Results: A total of 947 children were included in analysis, with 406 cases of …
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Spatial and temporal structure of typhoid fever in Washington, D.C., 1895-1909: a geographic information systems exploration of urban health concerns
… results of the spatial analyses using Ripley’s K-function and the G<sub>i</sub>* statistic to evaluate spatial clustering patterns. The G<sub>i</sub>* statistic identified localized hotspots that refute the conclusions of the original reports. Typhoid clusters varied in size and location, and …
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Infiltration Models for Engineered Media in Living Roofs and Bioretention
… Richards equation with commonly-used hydraulic functions for modeling one-dimensional infiltration process in unsaturated engineered media. The hydraulic properties, including saturated hydraulic conductivity (Ks), water retention characteristic (WRC) and unsaturated hydraulic conductivity …
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First- and Second-Order Properties of Spatiotemporal Point Patterns in the Space-Time and Frequency Domains
… domain through an extension of Ripley's Κ-function. An alternative analysis is given in the frequency domain though construction of a spatiotemporal periodogram. The methodology provided is tested through simulation of spatiotemporal point patterns and by analysis of a real data set. The …
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Seasonal Movements and Spatial Distributions of Common Carp in an Interconnected Glacial Lake System in Eastern South Dakota
… biotic perturbations and disrupt ecological functions of shallow lake ecosystems. Despite the high densities often observed in eastern South Dakota glacial lakes, biological information and a strategic plan for their management are relatively nonexistent. Understanding common carp movement …
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Modeling spatial patterns of mixed-species Appalachian forests with Gibbs point processes
Stochastic point processes and associated methodology provide a means for the statistical analysis and modeling of the spatial point pattern formed from forest tree stem locations. Stochastic Gibbs point processes were explored as models that could simulate short-range clustering arising from …