Am_data

Americium (Am) concentrations in a spatial domain immediately surrounding the location at which nuclear devices were detonated at Area 13 of the Nevada Test Site, between 1954 and 1963.

datasets

A tool for spatial/spatio-temporal modelling and prediction with large datasets. The approach models the field, and hence the covariance function, using a set of basis functions. This fixed-rank basis-function representation facilitates the modelling of big data, and the method naturally allows for non-stationary, anisotropic covariance functions. Discretisation of the spatial domain into so-called basic areal units (BAUs) facilitates the use of observations with varying support (i.e., both point-referenced and areal supports, potentially simultaneously), and prediction over arbitrary user-specified regions. `FRK` also supports inference over various manifolds, including the 2D plane and 3D sphere, and it provides helper functions to model, fit, predict, and plot with relative ease. Version 2.0.0 and above also supports the modelling of non-Gaussian data (e.g., Poisson, binomial, negative-binomial, gamma, and inverse-Gaussian) by employing a generalised linear mixed model (GLMM) framework. Zammit-Mangion and Cressie <doi:10.18637/jss.v098.i04> describe `FRK` in a Gaussian setting, and detail its use of basis functions and BAUs, while Sainsbury-Dale, Zammit-Mangion, and Cressie <doi:10.18637/jss.v108.i10> describe `FRK` in a non-Gaussian setting; two vignettes are available that summarise these papers and provide additional examples.

Andrew ZammitMangion

Fixed Rank Kriging

Andrew Zammit-Mangion

Matthew Sainsbury-Dale

Am_data function

A data frame with 212 rows and 3 variables:<dl>
 <dt>Easting</dt>
<dd>Easting in metres</dd> <dt>Northing</dt>
<dd>Northing in metres</dd> <dt>Am</dt>
<dd>Americium concentration in 1000 counts per minute</dd>
</dl>

Format

Americium soil data — Am_data

A data frame with 212 rows and 3 variables:<dl>
 <dt>Easting</dt>
<dd>Easting in metres</dd>

 <dt>Northing</dt>
<dd>Northing in metres</dd>

 <dt>Am</dt>
<dd>Americium concentration in 1000 counts per minute</dd>


</dl>

Am_data: Americium soil data

Description

Usage

Arguments

Format

References