gnu: Add r-psych.

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

gnu/packages/cran.scm

@@ -2974,3 +2974,34 @@ written for Matlab and GNU Octave.  It includes filter generation utilities,
 filtering functions, resampling routines, and visualization of filter models.
 It also includes interpolation functions.")
     (license license:gpl2)))
+
+(define-public r-psych
+  (package
+    (name "r-psych")
+    (version "1.7.8")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (cran-uri "psych" version))
+       (sha256
+        (base32
+         "0daismb8pdk392vdy304hqx0m3jx62gx3a0hygjygc125rhfla7k"))))
+    (build-system r-build-system)
+    (propagated-inputs
+     `(("r-foreign" ,r-foreign)
+       ("r-lattice" ,r-lattice)
+       ("r-mnormt" ,r-mnormt)
+       ("r-nlme" ,r-nlme)))
+    (home-page "http://cran.r-project.org/web/packages/psych")
+    (synopsis "Procedures for psychological, psychometric, and personality research")
+    (description
+     "This package provides a general purpose toolbox for personality,
+psychometric theory and experimental psychology.  The functions are primarily
+for multivariate analysis and scale construction using factor analysis,
+principal component analysis, cluster analysis and reliability analysis,
+although others provide basic descriptive statistics.  It provides functions
+for analyzing data at multiple levels within and between group statistics,
+including correlations and factor analysis; functions for simulating and
+testing particular item and test structures are included.  Several functions
+serve as a useful front end for structural equation modeling.")
+    (license license:gpl2+)))