diff --git a/DESCRIPTION b/DESCRIPTION
index c82f275..c856b82 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -19,6 +19,7 @@ Depends:
     methods
 Collate:
     'VirtualTwins.R'
+    'data.R'
     'object.R'
     'difft.R'
     'setClass.R'
diff --git a/R/data.R b/R/data.R
new file mode 100644
index 0000000..fc5dead
--- /dev/null
+++ b/R/data.R
@@ -0,0 +1,38 @@
+#' Clinical Trial for Sepsis desease
+#' 
+#' Simulated clinical trial with two groups treatment about sepsis desease. See details.
+#' 
+#' This dataset is taken from 
+#' \link[=http://biopharmnet.com/wiki/Software_for_subgroup_identification_and_analysis]{SIDES
+#' method}.
+#' 
+#' \code{Sepsis} contains simulated data on 470 subjects with a binary outcome 
+#' survival, that stores survival status for patient after 28 days of treatment,
+#' value of 1 for subjects who died after 28 days and 0 otherwise. There are 11 
+#' covariates, listed below, all of which are numerical variables.
+#' 
+#' Note that contrary to the original dataset used in SIDES, missing values have
+#' been imputed by random forest \code{(randomForest::rfImpute())}
+#' 
+#' True subgroup is \emph{PRAPACHE <= 26 & AGE <= 49.80}
+#' 
+#' @format 470 patients and 13 variables.
+#' \describe{
+#'  \item{survival}{binary outcome}
+#'  \item{THERAPY}{1 for active treatment, 0 for control treatment}
+#'  \item{TIMFIRST}{Time from first sepsis-organ fail to start drug}
+#'  \item{AGE}{Patient age in years}
+#'  \item{BLLPLAT}{Baseline local platelets}
+#'  \item{blSOFA}{Sum of baselin sofa (cardiovascular, hematology, hepaticrenal, and respiration scores)}
+#'  \item{BLLCREAT}{Base creatinine}
+#'  \item{ORGANNUM}{Number of baseline organ failures}
+#'  \item{PRAPACHE}{Pre-infusion apache-ii score}
+#'  \item{BLGCS}{Base GLASGOW coma scale score}
+#'  \item{BLIL6}{Baseline serum IL-6 concentration}
+#'  \item{BLADL}{Baseline activity of daily living score}
+#'  \item{BLLBILI}{Baseline local bilirubin}
+#' }
+#' 
+#' @source \url{http://biopharmnet.com/wiki/Software_for_subgroup_identification_and_analysis}
+#' @name sepsis
+NULL
diff --git a/data/sepsis.RData b/data/sepsis.rdata
similarity index 100%
rename from data/sepsis.RData
rename to data/sepsis.rdata
diff --git a/man/VirtualTwins.Rd b/man/VirtualTwins.Rd
index 5f669f8..0048537 100644
--- a/man/VirtualTwins.Rd
+++ b/man/VirtualTwins.Rd
@@ -13,9 +13,6 @@ VirtualTwins is written mainly with reference classes. Briefly, there is three k
  \item \code{\link{VT.tree}} class to find subgroups from \code{\link{difft}} by CART trees. \code{\link{VT.tree.class}} and \code{\link{VT.tree.reg}} extend it.
 }
 }
-\details{
-\encoding{UTF-8}
-}
 \section{TODO LIST}{
 
 \emph{last update : 11.06.2015}
diff --git a/man/sepsis.Rd b/man/sepsis.Rd
new file mode 100644
index 0000000..2973876
--- /dev/null
+++ b/man/sepsis.Rd
@@ -0,0 +1,43 @@
+% Generated by roxygen2 (4.1.1): do not edit by hand
+% Please edit documentation in R/data.R
+\name{sepsis}
+\alias{sepsis}
+\title{Clinical Trial for Sepsis desease}
+\format{470 patients and 13 variables.
+\describe{
+ \item{survival}{binary outcome}
+ \item{THERAPY}{1 for active treatment, 0 for control treatment}
+ \item{TIMFIRST}{Time from first sepsis-organ fail to start drug}
+ \item{AGE}{Patient age in years}
+ \item{BLLPLAT}{Baseline local platelets}
+ \item{blSOFA}{Sum of baselin sofa (cardiovascular, hematology, hepaticrenal, and respiration scores)}
+ \item{BLLCREAT}{Base creatinine}
+ \item{ORGANNUM}{Number of baseline organ failures}
+ \item{PRAPACHE}{Pre-infusion apache-ii score}
+ \item{BLGCS}{Base GLASGOW coma scale score}
+ \item{BLIL6}{Baseline serum IL-6 concentration}
+ \item{BLADL}{Baseline activity of daily living score}
+ \item{BLLBILI}{Baseline local bilirubin}
+}}
+\source{
+\url{http://biopharmnet.com/wiki/Software_for_subgroup_identification_and_analysis}
+}
+\description{
+Simulated clinical trial with two groups treatment about sepsis desease. See details.
+}
+\details{
+This dataset is taken from
+\link[=http://biopharmnet.com/wiki/Software_for_subgroup_identification_and_analysis]{SIDES
+method}.
+
+\code{Sepsis} contains simulated data on 470 subjects with a binary outcome
+survival, that stores survival status for patient after 28 days of treatment,
+value of 1 for subjects who died after 28 days and 0 otherwise. There are 11
+covariates, listed below, all of which are numerical variables.
+
+Note that contrary to the original dataset used in SIDES, missing values have
+been imputed by random forest \code{(randomForest::rfImpute())}
+
+True subgroup is \emph{PRAPACHE <= 26 & AGE <= 49.80}
+}
+