gnu: Add r-calibrate.

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

gnu/packages/cran.scm

@@ -21,7 +21,8 @@
   #:use-module (guix packages)
   #:use-module (guix download)
   #:use-module (guix utils)
-  #:use-module (guix build-system r))
+  #:use-module (guix build-system r)
+  #:use-module (gnu packages statistics))
 
 (define-public r-colorspace
   (package
@@ -172,3 +173,24 @@ curve (AUACC), and the area under the receiver operating characteristic
 curve (AUROC).  The curves can also be visualized.  Support for partial areas
 is provided.")
     (license license:gpl2+)))
+
+(define-public r-calibrate
+  (package
+    (name "r-calibrate")
+    (version "1.7.2")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (cran-uri "calibrate" version))
+       (sha256
+        (base32
+         "010nb1nb9y7zhw2k6d2i2drwy5brp7b83mjj2w7i3wjp9xb6l1kq"))))
+    (build-system r-build-system)
+    (propagated-inputs
+     `(("r-mass" ,r-mass)))
+    (home-page "http://cran.r-project.org/web/packages/calibrate")
+    (synopsis "Calibration of scatterplot and biplot axes")
+    (description
+     "This is a package for drawing calibrated scales with tick marks
+on (non-orthogonal) variable vectors in scatterplots and biplots.")
+    (license license:gpl2)))