diff --git a/DESCRIPTION b/DESCRIPTION
index f15ef04..75a6976 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -2,8 +2,8 @@ Encoding: UTF-8
 Package: rkTeaching
 Type: Package
 Title: A RKWard plugin with basic utilities for teaching Statistics
-Version: 1.3.0
-Date: 2019-09-01
+Version: 1.3.5
+Date: 2022-17-13
 Author: Alfredo Sánchez Alberca <asalber@ceu.es>
 Maintainer: Alfredo Sánchez Alberca <asalber@ceu.es>
 Enhances: rkward
@@ -21,6 +21,7 @@ Depends:
     Hmisc,
     prob,
     ez,
+    multcomp,
     R (>= 3.5.0)
 Description: Basic utilities for teaching statistics.
     It contains procedures for:
diff --git a/R/weightDataFrame.R b/R/weightDataFrame.R
index 59951da..65fe4b0 100644
--- a/R/weightDataFrame.R
+++ b/R/weightDataFrame.R
@@ -1,13 +1,11 @@
 weightDataFrame <- function(data, freq){
-  if (ncol(data)<2) {
-    stop("The data frame must contain at least two variables.")
-  }
-  if (!is.numeric(data[["freq"]])) {
-    stop("The freq variable should contain frequencies and must be numeric.")
-  }
-  times <- as.integer(data[[freq]])
-  data[[freq]] <- NULL
-  result <- data[rep(seq_len(nrow(data)), times),]
+ reps <- data[[freq]]
+  data[[freq]] <- NULL 
+  m <- as.matrix(data)
+  result <- as.vector(m)
+  result <- matrix(rep(result,rep(reps,ncol(m))),sum(reps),ncol(m));
+  result <- as.data.frame(result);
+  colnames(result) <- colnames(data)
   return(result)
 }
 
diff --git a/inst/rkward/plugins/common/common_functions.js b/inst/rkward/plugins/common/common_functions.js
index ab5a424..d989625 100644
--- a/inst/rkward/plugins/common/common_functions.js
+++ b/inst/rkward/plugins/common/common_functions.js
@@ -3,6 +3,6 @@ function getDataframe(vars) {
     if (Array.isArray(vars)) {
         return vars.join().split('[[')[0];
     } else {
-        return vars.split('[[')[0];
+        return vars.toString().split('[[')[0];
     }
 }
diff --git a/inst/rkward/plugins/data/data_weighting.js b/inst/rkward/plugins/data/data_weighting.js
index 79611e5..b08ced5 100644
--- a/inst/rkward/plugins/data/data_weighting.js
+++ b/inst/rkward/plugins/data/data_weighting.js
@@ -1,23 +1,26 @@
 // author: Alfredo Sánchez Alberca (asalber@ceu.es)
-var dataframe,
-    freq,
-    newDataframe;
 
-function setGlobalVars() {
-    dataframe = getString("dataframe");
-    freq = getString("freq.shortname");
-    newDataframe = getString("newDataframe");
-}
+// globals
+var data, newdata, freq;
 
-function preprocess() {
-    setGlobalVars();
-    echo("library(rkTeaching)\n");
+function preprocess(){
+	// add requirements etc. here
+	echo("require(rkTeaching)\n");
 }
 
-function calculate() {
-    echo('.GlobalEnv$' + newDataframe + ' <- weightDataFrame(' + dataframe + ', "' + freq + '")\n');
+function calculate () {
+	data = getString("dataframe");
+	newdata = getString("save");
+	freq = getString("freq.shortname");
+	echo ('.GlobalEnv$' + newdata + ' <- weightDataFrame(' + data + ', "' + freq + '")\n');	
+	// Copy also the labels of original data set
+	echo('for(i in 1:length(names(' + newdata + '))){\n');
+	echo('\t if (names(' + newdata + ')[i]!= "' + freq + '"){\n');
+    echo('\t attr(.GlobalEnv$' + newdata + '[[names(' + newdata + ')[i]]],".rk.meta") = attr(' + data + '[[names(' + newdata + ')[i]]],".rk.meta")\n');
+    echo('\t }\n');
+    echo('}\n');
 }
 
-function printout() {
-    var header = new Header(i18n("Data weighting")).addFromUI("dataframe").addFromUI("freq").addFromUI("newDataframe").print();
+function printout () {
+	echo ('rk.header ("Ponderaci&oacute;n de conjunto de datos", parameters=list("Conjunto de datos a ponderar" = "' + data + '", "Frecuencias de ponderaci&oacute;n" = "' + freq + '", "Nuevo conjunto de datos" = rk.get.description(' + newdata + ')))\n');
 }
diff --git a/inst/rkward/plugins/data/data_weighting.xml b/inst/rkward/plugins/data/data_weighting.xml
index fc79a0d..efce73d 100644
--- a/inst/rkward/plugins/data/data_weighting.xml
+++ b/inst/rkward/plugins/data/data_weighting.xml
@@ -6,43 +6,45 @@
 	<help file="data_weighting.rkh"/>
 
 	<logic>
-		<connect governor="current_object" client="dataframe.available"/>
-		<connect governor="dataframe.available" client="selector.root"/>
-		<convert id="dataframeSelected" sources="dataframe.available" mode="notequals" standard=""/>
-		<connect governor="dataframeSelected" client="freq.enabled"/>
-	</logic>
-
-	<dialog label="Data weighting">
-		<row>
-			<varselector id="selector" label="Select data frame or variable"/>
+		<connect governor="current_object" client="dataframe.available" />
+		<connect governor="dataframe.available" client="selector.root" />
+	</logic>	
+		
+	<dialog label="Ponderar conjunto de datos" >
+		<row id="row_vars">
+			<varselector id="selector" label="Seleccionar conjunto de datos"/>
 			<column>
-				<varslot id="dataframe" label="Data frame to weight" source="selector" classes="data.frame" required="true"/>
-				<varslot id="freq" label="Weighting frequencies" source="selector" types="numeric" required="true"/>
-				<saveobject id="newDataframe" label="Save new data frame" initial="new.data.frame"/>
+				<varslot id="dataframe" label="Conjunto de datos a ponderar" source="selector" classes="data.frame" required="true" />
+				<varslot id="freq" label="Frecuencias de ponderación" source="selector" types="number" required="true" />
+				<saveobject id="save" label="Guardar conjunto de datos" initial="datos.nuevo" />
 			</column>
 		</row>
 	</dialog>
-
-	<wizard label="Data weighting">
-		<page id="pageData">
+	
+	<wizard label="Ponderar conjunto de datos">
+		<page id="page_data">
 			<text>
-				Select the data frame to weight.
+				Seleccionar el conjunto de datos a ponderar.
+
 			</text>
-			<varselector id="selector2" label="Select data frame"/>
-			<varslot id="dataframe" label="Data frame to weight" source="selector2" classes="data.frame" required="true"/>
+			<varselector id="selector2" label="Seleccionar conjunto de datos"/>
+			<varslot id="dataframe" label="Conjunto de datos" source="selector2" classes="data.frame" required="true" />
 		</page>
-		<page id="pageFrequency">
+		<page id="page_frequency">
 			<text>
-				Select the variable that contains the weighting frequencies.
+				Seleccionar la variable que contiene las frecuencias de ponderación. 
+				Debe haber tantas frecuencias como filas tenga el conjunto de datos a ponderar. 
+
 			</text>
-			<copy id="selector"/>
+			<copy id="selector" />
 		</page>
-		<page id="pageSave">
+		<page id="page_new_data">
 			<text>
-				Enter the name for the new data set. By default the new data set is saved in the .GlobalEnv environment.
+				Introducir un nombre para el nuevo conjunto de datos.
+				Por defecto el nuevo conjunto de datos se guarda en el espacio de trabajo global .GlobalEnv.
+
 			</text>
-			<copy id="newDataframe"/>
-			<stretch/>
+			<copy id="save" />
 		</page>
 	</wizard>
 </document>
diff --git a/inst/rkward/plugins/data/variable_recoding.js b/inst/rkward/plugins/data/variable_recoding.js
index 2e07224..400cc72 100644
--- a/inst/rkward/plugins/data/variable_recoding.js
+++ b/inst/rkward/plugins/data/variable_recoding.js
@@ -19,11 +19,11 @@ function calculate() {
     rules = rules.replace(/\n/gi, '; ').replace(/'/g, '"');
     comment("Applying the recoding rules");
     echo(".GlobalEnv$" + save + " <- Recode(" + variable + ", '" + rules + "'");
-    if (asfactor) {
-        echo(", as.factor=TRUE");
-    } else {
-        echo(", as.factor=FALSE");
-    }
+    //if (asfactor) {
+      //  echo(", as.factor=TRUE");
+    //} else {
+      //  echo(", as.factor=FALSE");
+    //}
     echo(")\n");
 }
 
diff --git a/inst/rkward/plugins/non_parametric_tests/kruskal_wallis.js b/inst/rkward/plugins/non_parametric_tests/kruskal_wallis.js
index 631783c..f4b31cb 100644
--- a/inst/rkward/plugins/non_parametric_tests/kruskal_wallis.js
+++ b/inst/rkward/plugins/non_parametric_tests/kruskal_wallis.js
@@ -56,7 +56,7 @@ function printout() {
 	// Header
 	header = new Header(i18n("Kruskal-Wallis test for comparing the distribution of %1 according to %2", variableName, factorName));
 	header.add(i18n("Data frame"), dataframe);
-	header.add(i18n("Comparison of %1 according to %2", variableName, factorName));
+	header.add(i18n("Comparison of"), i18n("%1 according to %2", variableName, factorName));
 	header.add(i18n("Null hypothesis"), i18n("There is no significant difference between the populations"));
 	header.add(i18n("Alternative hypothesis"), i18n("There are significant difference between at least two populations"));
 	if (grouped) {
@@ -104,4 +104,4 @@ function printout() {
 			echo('))\n');
 		}
 	}
-}
\ No newline at end of file
+}