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diff --git a/var/spack/repos/builtin/packages/r-posterior/package.py b/var/spack/repos/builtin/packages/r-posterior/package.py
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+# Copyright 2013-2021 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack import *
+
+
+class RPosterior(RPackage):
+    """Tools for Working with Posterior Distributions.
+
+    Provides useful tools for both users and developers of packages for
+    fitting Bayesian models or working with output from Bayesian models. The
+    primary goals of the package are to: (a) Efficiently convert between many
+    different useful formats of draws (samples) from posterior or prior
+    distributions. (b) Provide consistent methods for operations commonly
+    performed on draws, for example, subsetting, binding, or mutating draws.
+    (c) Provide various summaries of draws in convenient formats. (d) Provide
+    lightweight implementations of state of the art posterior inference
+    diagnostics. References: Vehtari et al. (2021) <doi:10.1214/20-BA1221>."""
+
+    homepage = "https://mc-stan.org/posterior/"
+    cran     = "posterior"
+
+    version('1.1.0', sha256='eff6262dbcc1bf18337f535b0c75ba2fe360322e8b170c466e24ed3ee76cf4d2')
+
+    depends_on('r@3.2.0:', type=('build', 'run'))
+    depends_on('r-abind', type=('build', 'run'))
+    depends_on('r-checkmate', type=('build', 'run'))
+    depends_on('r-rlang@0.4.7:', type=('build', 'run'))
+    depends_on('r-tibble@3.0.0:', type=('build', 'run'))
+    depends_on('r-vctrs', type=('build', 'run'))
+    depends_on('r-tensora', type=('build', 'run'))
+    depends_on('r-pillar', type=('build', 'run'))
+    depends_on('r-distributional', type=('build', 'run'))
+    depends_on('r-matrixstats', type=('build', 'run'))