diff --git a/examples/stats/wifi-example-sim.cc b/examples/stats/wifi-example-sim.cc
index 63044c701..601f66492 100644
--- a/examples/stats/wifi-example-sim.cc
+++ b/examples/stats/wifi-example-sim.cc
@@ -54,9 +54,8 @@ NS_LOG_COMPONENT_DEFINE ("WiFiDistanceExperiment");
 
 
 void TxCallback(Ptr<CounterCalculator<uint32_t> > datac,
-                std::string path, Ptr<const Packet> packet,
-                Mac48Address realto) {
-  NS_LOG_INFO("Sent frame to " << realto << "; counted in " <<
+                std::string path, Ptr<const Packet> packet) {
+  NS_LOG_INFO("Sent frame counted in " <<
               datac->GetKey());
   datac->Update();
   // end TxCallback
@@ -201,7 +200,7 @@ int main(int argc, char *argv[]) {
   Ptr<CounterCalculator<uint32_t> > totalTx =
     CreateObject<CounterCalculator<uint32_t> >();
   totalTx->SetKey("wifi-tx-frames");
-  Config::Connect("/NodeList/0/DeviceList/*/$ns3::WifiNetDevice/Tx",
+  Config::Connect("/NodeList/0/DeviceList/*/$ns3::WifiNetDevice/Mac/MacTx",
                   MakeBoundCallback(&TxCallback, totalTx));
   data.AddDataCalculator(totalTx);
 
@@ -212,9 +211,9 @@ int main(int argc, char *argv[]) {
   Ptr<PacketCounterCalculator> totalRx =
     CreateObject<PacketCounterCalculator>();
   totalRx->SetKey("wifi-rx-frames");
-  Config::Connect("/NodeList/1/DeviceList/*/$ns3::WifiNetDevice/Rx",
-                  MakeCallback(&PacketCounterCalculator::FrameUpdate,
-                                    totalRx));
+  Config::Connect("/NodeList/1/DeviceList/*/$ns3::WifiNetDevice/Mac/MacRx",
+                  MakeCallback(&PacketCounterCalculator::PacketUpdate,
+                               totalRx));
   data.AddDataCalculator(totalRx);
 
 
diff --git a/src/contrib/stats/data-output-interface.cc b/src/contrib/stats/data-output-interface.cc
index 2254008f0..dd89ff55b 100644
--- a/src/contrib/stats/data-output-interface.cc
+++ b/src/contrib/stats/data-output-interface.cc
@@ -45,3 +45,15 @@ DataOutputInterface::DoDispose()
   Object::DoDispose();
   // end DataOutputInterface::DoDispose
 }
+
+void
+DataOutputInterface::SetFilePrefix(const std::string prefix)
+{
+  m_filePrefix = prefix;
+}
+
+std::string
+DataOutputInterface::GetFilePrefix() const
+{
+  return m_filePrefix;
+}
diff --git a/src/contrib/stats/data-output-interface.h b/src/contrib/stats/data-output-interface.h
index 7ef26d271..20c7744e4 100644
--- a/src/contrib/stats/data-output-interface.h
+++ b/src/contrib/stats/data-output-interface.h
@@ -37,9 +37,14 @@ namespace ns3 {
 
     virtual void Output(DataCollector &dc) = 0;
 
+    void SetFilePrefix(const std::string prefix);
+    std::string GetFilePrefix() const;
+
   protected:
     virtual void DoDispose();
 
+    std::string m_filePrefix;
+
     // end class DataOutputInterface
   };
 
diff --git a/src/contrib/stats/omnet-data-output.cc b/src/contrib/stats/omnet-data-output.cc
index 50d86be52..d67742190 100644
--- a/src/contrib/stats/omnet-data-output.cc
+++ b/src/contrib/stats/omnet-data-output.cc
@@ -34,9 +34,10 @@ NS_LOG_COMPONENT_DEFINE("OmnetDataOutput");
 
 //--------------------------------------------------------------
 //----------------------------------------------
-OmnetDataOutput::OmnetDataOutput() :
-  m_filePrefix("data")
+OmnetDataOutput::OmnetDataOutput()
 {
+  m_filePrefix = "data";
+
   NS_LOG_FUNCTION_NOARGS();
 }
 OmnetDataOutput::~OmnetDataOutput()
@@ -52,17 +53,6 @@ OmnetDataOutput::DoDispose()
   // end OmnetDataOutput::DoDispose
 }
 
-void
-OmnetDataOutput::SetFilePrefix(const std::string prefix)
-{
-  m_filePrefix = prefix;
-}
-std::string
-OmnetDataOutput::GetFilePrefix() const
-{
-  return m_filePrefix;
-}
-
 //----------------------------------------------
 void
 OmnetDataOutput::Output(DataCollector &dc)
diff --git a/src/contrib/stats/omnet-data-output.h b/src/contrib/stats/omnet-data-output.h
index 0dec5201d..a3e1bb3f3 100644
--- a/src/contrib/stats/omnet-data-output.h
+++ b/src/contrib/stats/omnet-data-output.h
@@ -37,9 +37,6 @@ namespace ns3 {
 
     virtual void Output(DataCollector &dc);
 
-    void SetFilePrefix(const std::string prefix);
-    std::string GetFilePrefix() const;
-
   protected:
     virtual void DoDispose();
 
@@ -73,7 +70,6 @@ namespace ns3 {
       // end class OmnetOutputCallback
     };
 
-    std::string m_filePrefix;
     // end class OmnetDataOutput
   };
 
diff --git a/src/contrib/stats/sqlite-data-output.cc b/src/contrib/stats/sqlite-data-output.cc
index 79058e0c6..5e59d0f41 100644
--- a/src/contrib/stats/sqlite-data-output.cc
+++ b/src/contrib/stats/sqlite-data-output.cc
@@ -35,9 +35,9 @@ NS_LOG_COMPONENT_DEFINE("SqliteDataOutput");
 
 //--------------------------------------------------------------
 //----------------------------------------------
-SqliteDataOutput::SqliteDataOutput() :
-  m_dbFile("data.db")
+SqliteDataOutput::SqliteDataOutput()
 {
+  m_filePrefix = "data";
   NS_LOG_FUNCTION_NOARGS();
 }
 SqliteDataOutput::~SqliteDataOutput()
@@ -53,17 +53,6 @@ SqliteDataOutput::DoDispose()
   // end SqliteDataOutput::DoDispose
 }
 
-void
-SqliteDataOutput::SetDBFile(const std::string file)
-{
-  m_dbFile = file;
-}
-std::string
-SqliteDataOutput::GetDBFile() const
-{
-  return m_dbFile;
-}
-
 int
 SqliteDataOutput::Exec(std::string exe) {
   int res;
@@ -111,6 +100,7 @@ SqliteDataOutput::Exec(std::string exe) {
 void
 SqliteDataOutput::Output(DataCollector &dc)
 {
+  std::string m_dbFile = m_filePrefix + ".db";
 
   if (sqlite3_open(m_dbFile.c_str(), &m_db)) {
     NS_LOG_ERROR("Could not open sqlite3 database \"" << m_dbFile << "\"");
diff --git a/src/contrib/stats/sqlite-data-output.h b/src/contrib/stats/sqlite-data-output.h
index 60c118340..e14dbf995 100644
--- a/src/contrib/stats/sqlite-data-output.h
+++ b/src/contrib/stats/sqlite-data-output.h
@@ -40,9 +40,6 @@ namespace ns3 {
 
     virtual void Output(DataCollector &dc);
 
-    void SetDBFile(const std::string file);
-    std::string GetDBFile() const;
-
   protected:
     virtual void DoDispose();
 
@@ -82,7 +79,6 @@ namespace ns3 {
     sqlite3 *m_db;
     int Exec(std::string exe);
 
-    std::string m_dbFile;
     // end class SqliteDataOutput
   };