A Review of Nonparametric Hypothesis Tests of Isotropy Properties in Spatial Data

TL;DR

This paper reviews nonparametric hypothesis tests for isotropy in spatial data, highlighting their properties, implementation, and comparing methods through simulations, aiding practitioners in choosing appropriate tests.

Contribution

It provides a comprehensive overview of existing nonparametric tests for isotropy, including implementation guidance and a comparison via simulation, which was previously lacking.

Findings

Several tests effectively detect anisotropy in spatial data.

Graphical diagnostics can be subjective and misleading.

The R package spTest facilitates implementation of these tests.

Abstract

An important aspect of modeling spatially-referenced data is appropriately specifying the covariance function of the random field. A practitioner working with spatial data is presented a number of choices regarding the structure of the dependence between observations. One of these choices is determining whether or not an isotropic covariance function is appropriate. Isotropy implies that spatial dependence does not depend on the direction of the spatial separation between sampling locations. Misspecification of isotropy properties (directional dependence) can lead to misleading inferences, e.g., inaccurate predictions and parameter estimates. A researcher may use graphical diagnostics, such as directional sample variograms, to decide whether the assumption of isotropy is reasonable. These graphical techniques can be difficult to assess, open to subjective interpretations, and misleading. Hypothesis tests of the assumption of isotropy may be more desirable. To this end, a number of tests of directional dependence have been developed using both the spatial and spectral representations of random fields. We provide an overview of nonparametric methods available to test the hypotheses of isotropy and symmetry in spatial data. We summarize test properties, discuss important considerations and recommendations in choosing and implementing a test, compare several of the methods via a simulation study, and propose a number of open research questions. Several of the reviewed methods can be implemented in R using our package spTest, available on CRAN.