Chapter 11. Spatial Variability

11.1

Introduction

438

11.2

Description

438

11.3

Spatial Correlation Models

440

 

11.3.1

Spatial Correlation Models Used in PROC MIXED

440

 

11.3.2

Models with a Nugget Effect

442

11.4

Spatial Variability and Mixed Models

442

 

11.4.1

Integrating Spatial Variability into Mixed Models

442

 

11.4.2

Geostatistics Related to PROC MIXED

444

11.5

Example: Estimating Spatial Covariance

447

 

11.5.1

Estimating the No-Nugget Model

447

 

11.5.2

Likelihood Ratio Test of Spatial Covariance

450

 

11.5.3

Comparing Spatial Covariance Models

450

 

11.5.4

Comparing Spatial Models to Nonspatial Models

451

 

11.5.5

Estimating the Model with a Nugget Effect

453

11.6

Using Spatial Covariance for Adjustment: Part 1, Regression

457

 

11.6.1

A Regression Example

458

 

11.6.2

Comparison with Independent ...

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