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| spTest-package | Nonparametric Hypothesis Tests of Isotropy and Symmetry |
| coords.aniso | Geometric Anisotropy Correction from geoR |
| GuanTestGrid | Nonparametric Test of Isotropy Using the Sample Semivariogram |
| GuanTestUnif | Nonparametric Test of Isotropy Using the Sample Semivariogram |
| LuTest | Nonparametric Test of Symmetry Using the Periodogram |
| MaityTest | Nonparametric Test of Isotropy Using the Sample Covariogram |
| spTest | Nonparametric Hypothesis Tests of Isotropy and Symmetry |