diff --git a/tools/chunks/catchunks/aimd-statistics-collector.cpp b/tools/chunks/catchunks/aimd-statistics-collector.cpp
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+++ b/tools/chunks/catchunks/aimd-statistics-collector.cpp
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+/**
+ * Copyright (c) 2016,  Regents of the University of California,
+ *                      Colorado State University,
+ *                      University Pierre & Marie Curie, Sorbonne University.
+ *
+ * This file is part of ndn-tools (Named Data Networking Essential Tools).
+ * See AUTHORS.md for complete list of ndn-tools authors and contributors.
+ *
+ * ndn-tools is free software: you can redistribute it and/or modify it under the terms
+ * of the GNU General Public License as published by the Free Software Foundation,
+ * either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-tools 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * ndn-tools, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ *
+ * @author Weiwei Liu
+ */
+
+#include "aimd-statistics-collector.hpp"
+
+namespace ndn {
+namespace chunks {
+namespace aimd {
+
+StatisticsCollector::StatisticsCollector(PipelineInterestsAimd& pipeline, RttEstimator& rttEstimator,
+                                         std::ostream& osCwnd, std::ostream& osRtt)
+  : m_osCwnd(osCwnd)
+  , m_osRtt(osRtt)
+{
+  m_osCwnd << "time\tcwndsize\n";
+  m_osRtt  << "segment\trtt\trttvar\tsrtt\trto\n";
+  pipeline.afterCwndChange.connect(
+    [this] (Milliseconds timeElapsed, double cwnd) {
+      m_osCwnd << timeElapsed.count() / 1000 << '\t' << cwnd << '\n';
+    });
+  rttEstimator.afterRttMeasurement.connect(
+    [this] (const RttRtoSample& rttSample) {
+      m_osRtt << rttSample.segNo << '\t'
+              << rttSample.rtt.count() << '\t'
+              << rttSample.rttVar.count() << '\t'
+              << rttSample.sRtt.count() << '\t'
+              << rttSample.rto.count() << '\n';
+    });
+}
+
+} // namespace aimd
+} // namespace chunks
+} // namespace ndn
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