gnu: Add r-dyn.

* gnu/packages/cran.scm (r-dyn): New variable.

gnu/packages/cran.scm

@@ -4,6 +4,7 @@
 ;;; Copyright © 2017 Tobias Geerinckx-Rice <me@tobias.gr>
 ;;; Copyright © 2017 Raoul Bonnal <ilpuccio.febo@gmail.com>
 ;;; Copyright © 2018 Vijayalakshmi Vedantham <vijimay12@gmail.com>
+;;; Copyright © 2018 Sahithi Yarlagadda <sahi@swecha.net>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -3245,3 +3246,30 @@ (define-public r-riverplot
 different clusterings.  This package provides an implementation of Sankey
 plots for R.")
     (license license:gpl2+)))
+
+(define-public r-dyn
+  (package
+    (name "r-dyn")
+    (version "0.2-9.6")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (cran-uri "dyn" version))
+       (sha256
+        (base32
+         "16fqv9k7yxdgybwzafjkyqm16qpgqz13lcjpi6a1nc8xbzlzh0gb"))))
+    (build-system r-build-system)
+    (propagated-inputs
+     `(("r-zoo" ,r-zoo)))
+    (home-page "https://cran.r-project.org/web/packages/dyn")
+    (synopsis "Time series regression")
+    (description
+     "This package provides the dyn class interfaces @code{ts}, @code{irts},
+@code{zoo} and @code{zooreg} time series classes to @code{lm}, @code{glm},
+@code{loess}, @code{quantreg::rq}, @code{MASS::rlm},
+@code{MCMCpack::MCMCregress()}, @code{quantreg::rq()},
+@code{randomForest::randomForest()} and other regression functions, allowing
+those functions to be used with time series including specifications that may
+contain lags, diffs and missing values.")
+    ;; Any GPL version.
+    (license license:gpl2+)))