--- a/gnv-artifacts/src/main/java/de/intevation/gnv/statistics/TimeseriesStatistics.java	Thu Nov 12 11:40:32 2009 +0000
+++ b/gnv-artifacts/src/main/java/de/intevation/gnv/statistics/TimeseriesStatistics.java	Thu Nov 12 14:47:20 2009 +0000
@@ -47,9 +47,10 @@
      * Default Logging instance
      */
     private static Logger log = Logger.getLogger(TimeseriesStatistics.class);
-    private static boolean sDebug = log.isDebugEnabled();
 
-
+    /**
+     * Constructor
+     */
     public TimeseriesStatistics() {
         super();
     }
@@ -64,6 +65,7 @@
                                                      Collection<KeyValueDescibeData> dates
                                                      )
                                                      throws StatisticsException {
+        this.clearStatistics();
         DescriptiveStatistics lStatistics = null;
         SimpleRegression lRegression = null;
         Collection<StatisticSet> statisticSets = new ArrayList<StatisticSet>();
@@ -74,6 +76,7 @@
             Iterator<Result> resultIterator = resultSet.iterator();
             if (resultIterator.hasNext()) {
                 Result row = resultIterator.next();
+                Result previousRow = row;
                 break1 = row.getString("GROUP1");
                 break2 = row.getString("GROUP2");
                 break3 = row.getString("GROUP3");
@@ -94,21 +97,25 @@
 
                         lStatistics.clear();
                         lRegression.clear();
+                        
+                        this.clearStatistics();
 
                         lStatistics.addValue(row.getDouble("YORDINATE"));
-                        Double x = this.calculateXOrdinateValue(row);
+                        Double x = this.calculateXOrdinateValue(previousRow,row);
                         lRegression.addData(x, row.getDouble("YORDINATE"));
 
                         break1 = row.getString("GROUP1");
                         break2 = row.getString("GROUP2");
                         break3 = row.getString("GROUP3");
+                        previousRow = row;
                         row = resultIterator.next();
                         lSeries++;
                     } else {
 
                         lStatistics.addValue(row.getDouble("YORDINATE"));
-                        Double x = this.calculateXOrdinateValue(row);
+                        Double x = this.calculateXOrdinateValue(previousRow, row);
                         lRegression.addData(x, row.getDouble("YORDINATE"));
+                        previousRow = row;
                         row = resultIterator.next();
                     }
 
@@ -130,6 +137,8 @@
         return statisticSets;
     }
 
+    protected void clearStatistics(){}
+    
     /**
      * 
      * @param break1
@@ -166,7 +175,7 @@
         }
         return "";
     }
-    protected double calculateXOrdinateValue(Result row) throws SQLException {
+    protected double calculateXOrdinateValue(Result previousRow, Result row) throws SQLException {
         return new Double((row.getDate("XORDINATE")).getTime() / 1000 / 3600);
     }