gnu: r-pbkrtest: Move to (gnu packages cran).

* gnu/packages/statistics.scm (r-pbkrtest): Move from here...
* gnu/packages/cran.scm (r-pbkrtest): ...to here.

Change-Id: I4cd3810f9c815b385b896b8836276f3c2f128eff

gnu/packages/statistics.scm

@@ -2696,36 +2696,6 @@ for handling censored survival data.  Portfolio selection methods based on
 expected shortfall risk are also included.")
     (license license:gpl2+)))
 
-(define-public r-pbkrtest
-  (package
-    (name "r-pbkrtest")
-    (version "0.5.3")
-    (source
-     (origin
-       (method url-fetch)
-       (uri (cran-uri "pbkrtest" version))
-       (sha256
-        (base32
-         "0qxswrk54r40qmi9ky7jzv53mrlr2w2mrlf1czma597nzrb52gmh"))))
-    (build-system r-build-system)
-    (propagated-inputs
-     (list r-broom
-           r-doby
-           r-dplyr
-           r-lme4
-           r-mass
-           r-matrix
-           r-numderiv))
-    (native-inputs
-     (list r-knitr))
-    (home-page "https://people.math.aau.dk/~sorenh/software/pbkrtest/")
-    (synopsis "Methods for linear mixed model comparison")
-    (description
-     "This package implements a parametric bootstrap test and a Kenward Roger
-modification of F-tests for linear mixed effects models and a parametric
-bootstrap test for generalized linear mixed models.")
-    (license license:gpl2+)))
-
 (define-public r-rcppprogress
   (package
     (name "r-rcppprogress")