gnu: Add r-cvst.

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

gnu/packages/cran.scm

@@ -23,6 +23,7 @@
   #:use-module (guix utils)
   #:use-module (guix build-system r)
   #:use-module (gnu packages gcc)
+  #:use-module (gnu packages machine-learning)
   #:use-module (gnu packages maths)
   #:use-module (gnu packages perl)
   #:use-module (gnu packages statistics)
@@ -928,3 +929,34 @@ sampling from populations, given the observed tie pattern.  Except for Steel's
 test and the JT test it also combines these tests across several blocks of
 samples.")
     (license license:gpl2+)))
+
+(define-public r-cvst
+  (package
+    (name "r-cvst")
+    (version "0.2-1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (cran-uri "CVST" version))
+       (sha256
+        (base32
+         "17xacyi8cf37rr2xswx96qy7pwkaqq394awdlswykz3qlyzx4zx2"))))
+    (properties `((upstream-name . "CVST")))
+    (build-system r-build-system)
+    (propagated-inputs
+     `(("r-kernlab" ,r-kernlab)
+       ("r-matrix" ,r-matrix)))
+    (home-page "http://cran.r-project.org/web/packages/CVST")
+    (synopsis "Fast cross-validation via sequential testing")
+    (description
+     "This package implements the fast cross-validation via sequential
+testing (CVST) procedure.  CVST is an improved cross-validation procedure
+which uses non-parametric testing coupled with sequential analysis to
+determine the best parameter set on linearly increasing subsets of the data.
+Additionally to the CVST the package contains an implementation of the
+ordinary k-fold cross-validation with a flexible and powerful set of helper
+objects and methods to handle the overall model selection process.  The
+implementations of the Cochran's Q test with permutations and the sequential
+testing framework of Wald are generic and can therefore also be used in other
+contexts.")
+    (license license:gpl2+)))