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diff --git a/chart2/source/inc/StatisticsHelper.hxx b/chart2/source/inc/StatisticsHelper.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+#pragma once
+
+#include <com/sun/star/uno/Reference.h>
+#include <rtl/ustring.hxx>
+#include "charttoolsdllapi.hxx"
+
+namespace com::sun::star::beans { class XPropertySet; }
+namespace com::sun::star::chart2 { class XDataSeries; }
+namespace com::sun::star::chart2::data { class XDataProvider; }
+namespace com::sun::star::chart2::data { class XDataSequence; }
+namespace com::sun::star::chart2::data { class XDataSource; }
+namespace com::sun::star::chart2::data { class XLabeledDataSequence; }
+namespace com::sun::star::uno { template <typename > class Sequence; }
+namespace chart { class LabeledDataSequence; }
+
+namespace chart::StatisticsHelper
+{
+    /** Calculates 1/n * sum (x_i - x_mean)^2.
+
+        @see http://mathworld.wolfram.com/Variance.html
+     */
+    OOO_DLLPUBLIC_CHARTTOOLS double getVariance( const css::uno::Sequence< double > & rData );
+
+    // square root of the variance
+    OOO_DLLPUBLIC_CHARTTOOLS double getStandardDeviation( const css::uno::Sequence< double > & rData );
+
+    // also called "Standard deviation of the mean (SDOM)"
+    OOO_DLLPUBLIC_CHARTTOOLS double getStandardError( const css::uno::Sequence< double > & rData );
+
+    OOO_DLLPUBLIC_CHARTTOOLS css::uno::Reference< css::chart2::data::XLabeledDataSequence >
+        getErrorLabeledDataSequenceFromDataSource(
+            const css::uno::Reference< css::chart2::data::XDataSource > & xDataSource,
+            bool bPositiveValue,
+            bool bYError = true );
+
+    OOO_DLLPUBLIC_CHARTTOOLS css::uno::Reference< css::chart2::data::XDataSequence >
+        getErrorDataSequenceFromDataSource(
+            const css::uno::Reference< css::chart2::data::XDataSource > & xDataSource,
+            bool bPositiveValue,
+            bool bYError = true );
+
+    OOO_DLLPUBLIC_CHARTTOOLS double getErrorFromDataSource(
+        const css::uno::Reference< css::chart2::data::XDataSource > & xDataSource,
+        sal_Int32 nIndex,
+        bool bPositiveValue,
+        bool bYError = true );
+
+    OOO_DLLPUBLIC_CHARTTOOLS void setErrorDataSequence(
+        const css::uno::Reference< css::chart2::data::XDataSource > & xDataSource,
+        const css::uno::Reference< css::chart2::data::XDataProvider > & xDataProvider,
+        const OUString & rNewRange,
+        bool bPositiveValue,
+        bool bYError = true,
+        OUString const * pXMLRange = nullptr );
+
+    /// @return the newly created or existing error bar object
+    OOO_DLLPUBLIC_CHARTTOOLS css::uno::Reference< css::beans::XPropertySet >
+        addErrorBars(
+            const css::uno::Reference< css::chart2::XDataSeries > & xDataSeries,
+            sal_Int32 nStyle,
+            bool bYError = true );
+
+    OOO_DLLPUBLIC_CHARTTOOLS css::uno::Reference< css::beans::XPropertySet >
+        getErrorBars(
+            const css::uno::Reference< css::chart2::XDataSeries > & xDataSeries,
+            bool bYError = true );
+
+    OOO_DLLPUBLIC_CHARTTOOLS bool hasErrorBars(
+        const css::uno::Reference< css::chart2::XDataSeries > & xDataSeries,
+        bool bYError = true );
+
+    OOO_DLLPUBLIC_CHARTTOOLS void removeErrorBars(
+        const css::uno::Reference< css::chart2::XDataSeries > & xDataSeries,
+        bool bYError = true );
+
+    OOO_DLLPUBLIC_CHARTTOOLS bool usesErrorBarRanges(
+        const css::uno::Reference< css::chart2::XDataSeries > & xDataSeries,
+        bool bYError = true );
+
+} //  namespace chart
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */