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# Statistical Analysis and Modelling of Spatial Point Patterns. Statistics in Practice

• Published: January 2008
• Region: Global
• 560 Pages
• John Wiley and Sons Ltd

Spatial point processes are mathematical models used to describe and analyse the geometrical structure of patterns formed by objects that are irregularly or randomly distributed in one-, two- or three-dimensional space. Examples include locations of trees in a forest, blood particles on a glass plate, galaxies in the universe, and particle centres in samples of material.

Numerous aspects of the nature of a specific spatial point pattern may be described using the appropriate statistical methods. Statistical Analysis and Modelling of Spatial Point Patterns provides a practical guide to the use of these specialised methods. The application-oriented approach helps demonstrate the benefits of this increasingly popular branch of statistics to a broad audience.

The book:
- Provides an introduction to spatial point patterns for researchers across numerous areas of application
- Adopts an extremely accessible style, allowing the non-statistician complete understanding
- Describes the process of extracting knowledge from the data, emphasising the marked point process
- Demonstrates the analysis of complex datasets, using applied examples from areas including biology,

Preface.

List of Examples.

1. Introduction.

1.1 Point process statistics.

1.2 Examples of point process data.

1.2.1 A pattern of amacrine cells.

1.2.2 Gold particles.

1.2.3 A pattern of Western Australian plants.

1.2.4 Waterstriders.

1.2.5 A sample of concrete.

1.3 Historical notes.

1.3.1 Determination of number of trees in a forest.

1.3.2 Number of blood particles in a sample.

1.3.3 Patterns of points in plant communities.

1.3.4 Formulating the power law for the pair correlation function for galaxies.

1.4 Sampling and data collection.

1.4.1 General remarks.

1.4.2 Choosing an appropriate study area.

1.4.3 Data collection.

1.5 Fundamentals of the theory of point processes.

1.6 Stationarity and isotropy.

1.6.1 Model approach and design approach.

1.6.2 Finite and infinite point processes.

1.6.3 Stationarity and isotropy.

1.6.4 Ergodicity.

1.7 Summary characteristics for point processes.

1.7.1 Numerical summary characteristics.

1.7.2 Functional summary characteristics.

1.8 Secondary structures of point processes.

1.8.1 Introduction.

1.8.2 Random sets.

1.8.3 Random fields.

1.8.4 Tessellations.

1.8.5 Neighbour networks or graphs.

1.9 Simulation of point processes.

2. The Homogeneous Poisson point process.

2.1 Introduction.

2.2 The binomial point process.

2.2.1 Introduction.

2.2.2 Basic properties.

2.2.3 The periodic binomial process.

2.2.4 Simulation of the binomial process.

2.3 The homogeneous Poisson point process.

2.3.1 Introduction.

2.3.2 Basic properties.

2.3.3 Characterisations of the homogeneous Poisson process.

2.4 Simulation of a homogeneous Poisson process.

2.5 Model characteristics.

2.5.1 Moments and moment measures.

2.5.2 The Palm distribution of a homogeneous Poisson process.

2.5.3 Summary characteristics of the homogeneous Poisson process.

2.6 Estimating the intensity.

2.7 Testing complete spatial randomness.

2.7.1 Introduction.

2.7.3 Distance methods.

2.7.4 The J-test.

2.7.5 Two index-based tests.

2.7.6 Discrepancy tests.

2.7.7 The L-test.

2.7.8 Other tests and recommendations.

3. Finite point processes.

3.1 Introduction.

3.2 Distributions of numbers of points.

3.2.1 The binomial distribution.

3.2.2 The Poisson distribution.

3.2.3 Compound distributions.

3.2.4 Generalised distributions.

3.3 Intensity functions and their estimation.

3.3.1 Parametric statistics for the intensity function.

3.3.2 Non-parametric estimation of the intensity function.

3.3.3 Estimating the point density distribution function.

3.4 Inhomogeneous Poisson process and finite Cox process.

3.4.1 The inhomogeneous Poisson process.

3.4.2 The finite Cox process.

3.5 Summary characteristics for finite point processes.

3.5.1 Nearest-neighbour distances.

3.5.2 Dilation function.

3.5.3 Graph-theoretic statistics.

3.5.4 Second-order characteristics.

3.6 Finite Gibbs processes.

3.6.1 Introduction.

3.6.2 Gibbs processes with fixed number of points.

3.6.3 Gibbs processes with a random number of points.

3.6.4 Second-order summary characteristics of finite Gibbs processes.

3.6.5 Further discussion.

3.6.6 Statistical inference for finite Gibbs processes.

4. Stationary point processes.

4.1 Basic definitions and notation.

4.2 Summary characteristics for stationary point processes.

4.2.1 Introduction.

4.2.2 Edge-correction methods.

4.2.3 The intensity ?.

4.2.4 Indices as summary characteristics.

4.2.5 Empty-space statistics and other morphological summaries.

4.2.6 The nearest-neighbour distance distribution function.

4.2.7 The J-function.

4.3 Second-order characteristics.

4.3.1 The three functions: K, L and g.

4.3.2 Theoretical foundations of second-order characteristics.

4.3.3 Estimators of the second-order characteristics.

4.3.4 Interpretation of pair correlation functions.

4.4 Higher-order and topological characteristics.

4.4.1 Introduction.

4.4.2 Third-order characteristics.

4.4.3 Delaunay tessellation characteristics.

4.4.4 The connectivity function.

4.5 Orientation analysis for stationary point processes.

4.5.1 Introduction.

4.5.2 Nearest-neighbour orientation distribution.

4.5.3 Second-order orientation analysis.

4.6 Outliers, gaps and residuals.

4.6.1 Introduction.

4.6.2 Simple outlier detection.

4.6.3 Simple gap detection.

4.6.4 Model-based outliers.

4.6.5 Residuals.

4.7 Replicated patterns.

4.7.1 Introduction.

4.7.2 Aggregation recipes.

4.8 Choosing appropriate observation windows.

4.8.1 General ideas.

4.8.2 Representative windows.

4.9 Multivariate analysis of series of point patterns.

4.10 Summary characteristics for the non-stationary case.

4.10.1 Formal application of stationary characteristics and estimators.

4.10.2 Intensity reweighting.

4.10.3 Local rescaling.

5. Stationary marked point processes.

5.1 Basic definitions and notation.

5.1.1 Introduction.

5.1.2 Marks and their properties.

5.1.3 Marking models.

5.1.4 Stationarity.

5.1.5 First-order characteristics.

5.1.6 Mark-sum measure.

5.1.7 Palm distribution.

5.2 Summary characteristics.

5.2.1 Introduction.

5.2.2 Intensity and mark-sum intensity.

5.2.3 Mean mark, mark d.f. and mark probabilities.

5.2.4 Indices for stationary marked point processes.

5.2.5 Nearest-neighbour distributions.

5.3 Second-order characteristics for marked point processes.

5.3.1 Introduction.

5.3.2 Definitions for qualitative marks.

5.3.3 Definitions for quantitative marks.

5.3.4 Estimation of second-order characteristics.

5.4 Orientation analysis for marked point processes.

5.4.1 Introduction.

5.4.2 Orientation analysis for non-isotropic processes with angular marks.

5.4.3 Orientation analysis for isotropic processes with angular marks.

5.4.4 Orientation analysis with constructed marks.

6. Modelling and simulation of stationary point processes.

6.1 Introduction.

6.2 Operations with point processes.

6.2.1 Thinning.

6.2.2 Clustering.

6.2.3 Superposition.

6.3 Cluster processes.

6.3.1 General cluster processes.

6.3.2 Neyman-Scott processes.

6.4 Stationary Cox processes.

6.4.1 Introduction.

6.4.2 Properties of stationary Cox processes.

6.5 Hard-core point processes.

6.5.1 Introduction.

6.5.2 Matérn hard-core processes.

6.5.4 The RSA model.

6.5.5 Random dense packings of hard spheres.

6.6 Stationary Gibbs processes.

6.6.1 Basic ideas and equations.

6.6.2 Simulation of stationary Gibbs processes.

6.6.3 Statistics for stationary Gibbs processes.

6.7 Reconstruction of point patterns.

6.7.1 Reconstructing point patterns without a specified model.

6.7.2 An example: reconstruction of Neyman-Scott processes.

6.7.3 Practical application of the reconstruction algorithm.

6.8 Formulas for marked point process models.

6.8.1 Introduction.

6.8.2 Independent marks.

6.8.3 Random field model.

6.8.4 Intensity-weighted marks.

6.9 Moment formulas for stationary shot-noise fields.

6.10 Space-time point processes.

6.10.1 Introduction.

6.10.2 Space-time Poisson processes.

6.10.3 Second-order statistics for completely stationary event processes.

6.10.4 Two examples of space-time processes.

6.11 Correlations between point processes and other random structures.

6.11.1 Introduction.

6.11.2 Correlations between point processes and random fields.

6.11.3 Correlations between point processes and fibre processes.

7. Fitting and testing point process models.

7.1 Choice of model.

7.2 Parameter estimation.

7.2.1 Maximum likelihood method.

7.2.2 Method of moments.

7.2.3 Trial-and-error estimation.

7.3 Variance estimation by bootstrap.

7.4 Goodness-of-fit tests.

7.4.1 Envelope test.

7.4.2 Deviation test.

7.5 Testing mark hypotheses.

7.5.1 Introduction.

7.5.2 Testing independent marking, test of association.

7.5.3 Testing geostatistical marking.

7.6 Bayesian methods for point pattern analysis.

Appendix A Fundamentals of statistics.

Appendix B Geometrical characteristics of sets.

Appendix C Fundamentals of geostatistics.

References.

Notation index.

Author index.

Subject index.

"It adopts an extremely accessible style, allowing the non-statistician complete understanding, describes the process of extracting knowledge from the data, emphasizing marked point processes, demonstrates the analysis of complex data sets, using applied examples from areas including biology, forestry, and materials science, and features a supplementary website containing example datasets. This text is ideally suited for researchers in many areas of applications, including environmental statistics, ecology, physics, material science, geostatistics, and biology. It is also suitable for students of statistics, mathematics, computer science, biology and geoinformatics." (Zentralblatt Math, 2010)

"Statistical Analysis and Modelling of Spatial Point Patterns is an extremely well-written book and is accessible to a wide audience, including both applied statisticians and researchers from other fields with a reasonably sophisticated background in statics." (Journal of the American Statistical Association, September 2010)“The book presents statistical methods that are relevant in practice, focusing on traditional methods, in particular those based on summary statistics, but also more recent models and methods are briefly discussed. ”(Biometrics , September 2009)

"The book is a useful addition to Wiley's series Statistics in Practice." (Journal of Tropical Pediatrics, February 2009)

"The abstract flavor this brings to the subject means that methods may have very wide applicability over different application domains. This applicability, in turn, is reflected by the large number of interesting examples described in the book. The book provides a comprehensive overview of the area." (International Statistical Review, December 2008)

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