diff --git a/R/data.R b/R/data.R
index 9c114a1342ccf42fcbc55b1beee36d46ad7a3380..5c486ef5c9f97bbcdef2b2747a6eddd5012891ea 100644
--- a/R/data.R
+++ b/R/data.R
@@ -7,7 +7,9 @@
 #'   \item{Date}{Date of weighing yyyy-mm-dd}
 #'   \item{IDE}{id of the animal}
 #'   \item{Day}{Date of weighing with day and time yyyy-mm-dd hh:mm:ss}
-#'   \item{dateNum}{Day expressed in numeric (portion of a day)}
+#'   \item{dateNum}{a rescaled date - fraction of the whole observational time 
+#'   for one individual. 
+#'   \eqn{dateNum=(Heure - min(Heure))/86400 + (Date - min(Date))/86400}}
 #' }
 "spring1"
 
@@ -20,7 +22,9 @@
 #'   \item{Date}{Date of weighing yyyy-mm-dd}
 #'   \item{IDE}{id of the animal}
 #'   \item{Day}{Date of weighing with day and time yyyy-mm-dd hh:mm:ss}
-#'   \item{dateNum}{Day expressed in numeric (portion of a day)}
+#'   \item{dateNum}{a rescaled date - fraction of the whole observational time 
+#'   for one individual. 
+#'   \eqn{dateNum=(Heure - min(Heure))/86400 + (Date - min(Date))/86400}}
 #' }
 "merinos1"
 
@@ -34,7 +38,9 @@
 #'   \item{Date}{Date of weighing yyyy-mm-dd}
 #'   \item{IDE}{id of the animal}
 #'   \item{Day}{Date of weighing with day and time yyyy-mm-dd hh:mm:ss}
-#'   \item{dateNum}{Day expressed in numeric (portion of a day)}
+#'   \item{dateNum}{a rescaled date - fraction of the whole observational time 
+#'   for one individual. 
+#'   \eqn{dateNum=(Heure - min(Heure))/86400 + (Date - min(Date))/86400}}
 #' }
 "merinos2"
 
@@ -47,6 +53,8 @@
 #'   \item{Date}{Date of weighing yyyy-mm-dd}
 #'   \item{IDE}{id of the animal}
 #'   \item{Day}{Date of weighing with day and time yyyy-mm-dd hh:mm:ss}
-#'   \item{dateNum}{Day expressed in numeric (portion of a day)}
+#'   \item{dateNum}{a rescaled date - fraction of the whole observational time 
+#'   for one individual. 
+#'   \eqn{dateNum=(Heure - min(Heure))/86400 + (Date - min(Date))/86400}}
 #' }
 "lambs"
diff --git a/man/lambs.Rd b/man/lambs.Rd
index 020dc970855047cd0db66f7eace31b441480da17..47c8129c820a6f7683ce34187cb4889e34ee5ba3 100644
--- a/man/lambs.Rd
+++ b/man/lambs.Rd
@@ -11,7 +11,9 @@ a data.frame
   \item{Date}{Date of weighing yyyy-mm-dd}
   \item{IDE}{id of the animal}
   \item{Day}{Date of weighing with day and time yyyy-mm-dd hh:mm:ss}
-  \item{dateNum}{Day expressed in numeric (portion of a day)}
+  \item{dateNum}{a rescaled date - fraction of the whole observational time 
+  for one individual. 
+  \eqn{dateNum=(Heure - min(Heure))/86400 + (Date - min(Date))/86400}}
 }
 }
 \usage{
diff --git a/man/merinos1.Rd b/man/merinos1.Rd
index 8469c9aa8a7c2c38f922aa47c81d2eded3114fa3..18954359fef352c8abb26b6bdefe170fc7a815cd 100644
--- a/man/merinos1.Rd
+++ b/man/merinos1.Rd
@@ -11,7 +11,9 @@ a data.frame
   \item{Date}{Date of weighing yyyy-mm-dd}
   \item{IDE}{id of the animal}
   \item{Day}{Date of weighing with day and time yyyy-mm-dd hh:mm:ss}
-  \item{dateNum}{Day expressed in numeric (portion of a day)}
+  \item{dateNum}{a rescaled date - fraction of the whole observational time 
+  for one individual. 
+  \eqn{dateNum=(Heure - min(Heure))/86400 + (Date - min(Date))/86400}}
 }
 }
 \usage{
diff --git a/man/merinos2.Rd b/man/merinos2.Rd
index 72d687f80fc6954578af7eb6f9af2bebf3400c83..d10c3206da9fa4938cb29caf72789a50a876c930 100644
--- a/man/merinos2.Rd
+++ b/man/merinos2.Rd
@@ -12,7 +12,9 @@ a data.frame
   \item{Date}{Date of weighing yyyy-mm-dd}
   \item{IDE}{id of the animal}
   \item{Day}{Date of weighing with day and time yyyy-mm-dd hh:mm:ss}
-  \item{dateNum}{Day expressed in numeric (portion of a day)}
+  \item{dateNum}{a rescaled date - fraction of the whole observational time 
+  for one individual. 
+  \eqn{dateNum=(Heure - min(Heure))/86400 + (Date - min(Date))/86400}}
 }
 }
 \usage{
diff --git a/man/spring1.Rd b/man/spring1.Rd
index c3aebf26295aaec4a3462639fca6c9dbe10868d1..185c8ab6572069e6074a3c5c4a4295a4d68bb9e6 100644
--- a/man/spring1.Rd
+++ b/man/spring1.Rd
@@ -11,7 +11,9 @@ a data.frame
   \item{Date}{Date of weighing yyyy-mm-dd}
   \item{IDE}{id of the animal}
   \item{Day}{Date of weighing with day and time yyyy-mm-dd hh:mm:ss}
-  \item{dateNum}{Day expressed in numeric (portion of a day)}
+  \item{dateNum}{a rescaled date - fraction of the whole observational time 
+  for one individual. 
+  \eqn{dateNum=(Heure - min(Heure))/86400 + (Date - min(Date))/86400}}
 }
 }
 \usage{