>From 694b581020d5b82ffb2ef3fe2a6a05bf0f703c05 Mon Sep 17 00:00:00 2001
From: Lars-Dominik Braun <address@hidden>
Date: Fri, 31 Jan 2020 18:32:48 +0100
Subject: [v2 14/34] gnu: Add package r-ltm

* gnu/packages/cran.scm (r-ltm): New variable.
---
 gnu/packages/cran.scm | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/gnu/packages/cran.scm b/gnu/packages/cran.scm
index 2d8e2f6f7d..ad4cf0bb0b 100644
--- a/gnu/packages/cran.scm
+++ b/gnu/packages/cran.scm
@@ -19634,3 +19634,30 @@ observation schemes are supported.  Both Markov transition rates and the hidden
 Markov output process can be modelled in terms of covariates, which may be
 constant or piecewise-constant in time.")
     (license license:gpl2+)))
+
+(define-public r-ltm
+  (package
+    (name "r-ltm")
+    (version "1.1-1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (cran-uri "ltm" version))
+       (sha256
+        (base32
+         "1qrgzwx5l58qf5rfp1knxc84r0g943q5sdr3ky74zzwpnmrf2vf7"))))
+    (properties `((upstream-name . "ltm")))
+    (build-system r-build-system)
+    (propagated-inputs
+     `(("r-mass" ,r-mass)
+       ("r-msm" ,r-msm)
+       ("r-polycor" ,r-polycor)))
+    (home-page "https://github.com/drizopoulos/ltm")
+    (synopsis "Latent trait models under IRT")
+    (description
+     "Analysis of multivariate dichotomous and polytomous data using latent
+trait models under the Item Response Theory approach.  It includes the Rasch,
+the Two-Parameter Logistic, the Birnbaum's Three-Parameter, the Graded
+Response, and the Generalized Partial Credit Models.")
+    (license license:gpl2+)))
+
-- 
2.20.1