diff --git a/src/settings/documentsettings.kcfg b/src/settings/documentsettings.kcfg
--- a/src/settings/documentsettings.kcfg
+++ b/src/settings/documentsettings.kcfg
@@ -16,5 +16,10 @@
     	<label>Visible columns in the main editor window.</label>
     	<whatsthis>Visible columns in the main editor window.</whatsthis>
 	</entry>
-  </group>
+    <entry name="CollapsedStatisticsViewItems" type="StringList">
+        <label>Collapsed tree view items of statistics view window.</label>
+        <whatsthis>Collapsed tree view items of statistics view window.</whatsthis>
+        <default></default>
+    </entry>
+</group>
 </kcfg>
diff --git a/src/statistics/lessonstatisticsview.h b/src/statistics/lessonstatisticsview.h
--- a/src/statistics/lessonstatisticsview.h
+++ b/src/statistics/lessonstatisticsview.h
@@ -28,7 +28,10 @@
 
 public:
     LessonStatisticsView(QWidget *parent);
+    ~LessonStatisticsView();
     void setModel(ContainerModel *model) Q_DECL_OVERRIDE;
+    void saveExpandedStatus() const;
+    void restoreExpandedStatus();
 
 public Q_SLOTS:
     void adjustColumnWidths();
@@ -45,6 +48,10 @@
     void setModel(QAbstractItemModel *model) Q_DECL_OVERRIDE {
         Q_UNUSED(model)
     }
+    void getCollapsedItems(QStringList &collapsedItems, const QModelIndex &item,
+                           QString name) const;
+    void setCollapsedItems(const QStringList &collapsedItems, const QModelIndex &item,
+                           QString name);
 };
 
 #endif
diff --git a/src/statistics/lessonstatisticsview.cpp b/src/statistics/lessonstatisticsview.cpp
--- a/src/statistics/lessonstatisticsview.cpp
+++ b/src/statistics/lessonstatisticsview.cpp
@@ -34,6 +34,7 @@
 #include "statisticsmodel.h"
 #include "keduvoclesson.h"
 #include "utils.h"
+#include "documentsettings.h"
 
 
 // GradeDelegate shows the graphic colored bar in the statistics,
@@ -115,6 +116,11 @@
 	    this,     &LessonStatisticsView::sectionResized);
 }
 
+LessonStatisticsView::~LessonStatisticsView()
+{
+    saveExpandedStatus();
+}
+
 void LessonStatisticsView::setModel(ContainerModel *model)
 {
     ContainerView::setModel(model);
@@ -173,3 +179,76 @@
     KEduVocLesson *lesson = static_cast<KEduVocLesson*>(selectedIndex.internalPointer());
     lesson->resetGrades(-1, KEduVocContainer::Recursive);
 }
+
+void LessonStatisticsView::saveExpandedStatus() const
+{
+    auto statisticsModel = qobject_cast<StatisticsModel *>(model());
+    Q_ASSERT(statisticsModel != nullptr);
+
+    QStringList collapsedItems;
+    getCollapsedItems(collapsedItems, statisticsModel->index(0, 0, QModelIndex()), QString());
+
+    const KEduVocDocument *doc = statisticsModel->document();
+    if (doc != nullptr) {
+        DocumentSettings documentSettings(doc->url().url());
+        documentSettings.setCollapsedStatisticsViewItems(collapsedItems);
+        documentSettings.save();
+    }
+}
+
+void LessonStatisticsView::getCollapsedItems(QStringList &collapsedItems, const QModelIndex &item,
+                                            QString name) const
+{
+    if (!item.isValid()) {
+        return;
+    }
+
+    int rowCount = model()->rowCount(item);
+    if (rowCount > 0) {
+        // Item has children and therefore expandable
+        name += item.data().toString();
+        if (!isExpanded(item)) {
+            collapsedItems << name;
+        }
+        for (int row = 0; row < rowCount; ++row) {
+            getCollapsedItems(collapsedItems, model()->index(row, 0, item), name + '/');
+        }
+    }
+}
+
+void LessonStatisticsView::restoreExpandedStatus()
+{
+    auto statisticsModel = qobject_cast<StatisticsModel *>(model());
+    Q_ASSERT(statisticsModel != nullptr);
+
+    const KEduVocDocument *doc = statisticsModel->document();
+    if (doc != nullptr) {
+        DocumentSettings documentSettings(doc->url().url());
+        documentSettings.load();
+        QStringList collapsedItems = documentSettings.collapsedStatisticsViewItems();
+        setCollapsedItems(collapsedItems, statisticsModel->index(0, 0, QModelIndex()), QString());
+    }
+}
+
+void LessonStatisticsView::setCollapsedItems(const QStringList &collapsedItems,
+                                             const QModelIndex &item, QString name)
+{
+    if (!item.isValid()) {
+        return;
+    }
+
+    int rowCount = model()->rowCount(item);
+    if (rowCount > 0) {
+        // Item has children and therefore expandable
+        name += item.data().toString();
+        if (collapsedItems.contains(name)) {
+            collapse(item);
+        } else {
+            expand(item);
+        }
+        for (int row = 0; row < rowCount; ++row) {
+            setCollapsedItems(collapsedItems, model()->index(row, 0, item), name + '/');
+        }
+    }
+}
+
diff --git a/src/statistics/statisticsmainwindow.cpp b/src/statistics/statisticsmainwindow.cpp
--- a/src/statistics/statisticsmainwindow.cpp
+++ b/src/statistics/statisticsmainwindow.cpp
@@ -88,7 +88,7 @@
     m_doc = doc;
     m_statisticsModel->setDocument(doc);
     m_ui->lessonStatistics->setModel(m_statisticsModel);
-    m_ui->lessonStatistics->expandAll();
+    m_ui->lessonStatistics->restoreExpandedStatus();
     m_ui->lessonStatistics->resizeColumnToContents(0);
 }
 
@@ -330,7 +330,8 @@
 
 void StatisticsMainWindow::updateModelSettings()
 {
+    m_ui->lessonStatistics->saveExpandedStatus();
     m_statisticsModel->updateDocumentSettings();
-    m_ui->lessonStatistics->expandAll();
+    m_ui->lessonStatistics->restoreExpandedStatus();
 }
 
diff --git a/src/statistics/statisticsmodel.h b/src/statistics/statisticsmodel.h
--- a/src/statistics/statisticsmodel.h
+++ b/src/statistics/statisticsmodel.h
@@ -55,6 +55,7 @@
     Qt::DropActions supportedDragActions() const  Q_DECL_OVERRIDE;
 
     void updateDocumentSettings();
+    const KEduVocDocument *document() const;
 
 public slots:
     virtual void setDocument(KEduVocDocument *doc) Q_DECL_OVERRIDE;
diff --git a/src/statistics/statisticsmodel.cpp b/src/statistics/statisticsmodel.cpp
--- a/src/statistics/statisticsmodel.cpp
+++ b/src/statistics/statisticsmodel.cpp
@@ -199,3 +199,9 @@
     endResetModel();
 }
 
+
+const KEduVocDocument *StatisticsModel::document() const
+{
+    return m_doc;
+}
+