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diff --git a/chart2/source/inc/StatisticsHelper.hxx b/chart2/source/inc/StatisticsHelper.hxx
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+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2000, 2010 Oracle and/or its affiliates.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org.  If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+#ifndef CHART2_STATISTICSHELPER_HXX
+#define CHART2_STATISTICSHELPER_HXX
+
+#include <com/sun/star/uno/Sequence.hxx>
+#include <com/sun/star/uno/XComponentContext.hpp>
+#include <com/sun/star/chart2/data/XDataSource.hpp>
+#include <com/sun/star/chart2/data/XDataProvider.hpp>
+#include <com/sun/star/chart2/XDataSeries.hpp>
+#include "charttoolsdllapi.hxx"
+
+namespace chart
+{
+
+class OOO_DLLPUBLIC_CHARTTOOLS StatisticsHelper
+{
+public:
+    /** Calculates 1/n * sum (x_i - x_mean)^2.
+
+        @see http://mathworld.wolfram.com/Variance.html
+
+        @param bUnbiasedEstimator
+            If true, 1/(n-1) * sum (x_i - x_mean)^2 is returned.
+     */
+    static double getVariance( const ::com::sun::star::uno::Sequence< double > & rData,
+        bool bUnbiasedEstimator = false );
+
+    // square root of the variance
+    static double getStandardDeviation( const ::com::sun::star::uno::Sequence< double > & rData );
+
+    // also called "Standard deviation of the mean (SDOM)"
+    static double getStandardError( const ::com::sun::star::uno::Sequence< double > & rData );
+
+    static ::com::sun::star::uno::Reference<
+            ::com::sun::star::chart2::data::XLabeledDataSequence >
+        getErrorLabeledDataSequenceFromDataSource(
+            const ::com::sun::star::uno::Reference<
+                ::com::sun::star::chart2::data::XDataSource > & xDataSource,
+            bool bPositiveValue,
+            bool bYError = true );
+
+    static ::com::sun::star::uno::Reference<
+            ::com::sun::star::chart2::data::XDataSequence >
+        getErrorDataSequenceFromDataSource(
+            const ::com::sun::star::uno::Reference<
+                ::com::sun::star::chart2::data::XDataSource > & xDataSource,
+            bool bPositiveValue,
+            bool bYError = true );
+
+    static double getErrorFromDataSource(
+        const ::com::sun::star::uno::Reference<
+            ::com::sun::star::chart2::data::XDataSource > & xDataSource,
+        sal_Int32 nIndex,
+        bool bPositiveValue,
+        bool bYError = true );
+
+    static void setErrorDataSequence(
+        const ::com::sun::star::uno::Reference<
+            ::com::sun::star::chart2::data::XDataSource > & xDataSource,
+        const ::com::sun::star::uno::Reference<
+            ::com::sun::star::chart2::data::XDataProvider > & xDataProvider,
+        const ::rtl::OUString & rNewRange,
+        bool bPositiveValue,
+        bool bYError = true,
+        ::rtl::OUString * pXMLRange = 0 );
+
+    /// @return the newly created or existing error bar object
+    static ::com::sun::star::uno::Reference<
+            ::com::sun::star::beans::XPropertySet >
+        addErrorBars(
+            const ::com::sun::star::uno::Reference<
+                ::com::sun::star::chart2::XDataSeries > & xDataSeries,
+            const ::com::sun::star::uno::Reference<
+                ::com::sun::star::uno::XComponentContext > & xContext,
+            sal_Int32 nStyle,
+            bool bYError = true );
+
+    static ::com::sun::star::uno::Reference<
+            ::com::sun::star::beans::XPropertySet >
+        getErrorBars(
+            const ::com::sun::star::uno::Reference<
+                ::com::sun::star::chart2::XDataSeries > & xDataSeries,
+            bool bYError = true );
+
+    static bool hasErrorBars(
+        const ::com::sun::star::uno::Reference<
+            ::com::sun::star::chart2::XDataSeries > & xDataSeries,
+        bool bYError = true );
+
+    static void removeErrorBars(
+        const ::com::sun::star::uno::Reference<
+            ::com::sun::star::chart2::XDataSeries > & xDataSeries,
+        bool bYError = true );
+
+    static bool usesErrorBarRanges(
+        const ::com::sun::star::uno::Reference<
+            ::com::sun::star::chart2::XDataSeries > & xDataSeries,
+        bool bYError = true );
+
+private:
+    // not implemented
+    StatisticsHelper();
+};
+
+} //  namespace chart
+
+// CHART2_STATISTICSHELPER_HXX
+#endif