diff --git a/ndncon/NCStatisticsWindowController.mm b/ndncon/NCStatisticsWindowController.mm
index 96120f0..1fa5595 100755
--- a/ndncon/NCStatisticsWindowController.mm
+++ b/ndncon/NCStatisticsWindowController.mm
@@ -16,6 +16,7 @@
 #import "NCStreamingController.h"
 #import "NSDictionary+NCAdditions.h"
 #import "NSObject+NCAdditions.h"
+#import "NSArray+NCAdditions.h"
 
 #define INTEREST_AVERAGE_SIZE_BYTES 150
 #define STAT_UPDATE_RATE 10 // per second
@@ -30,6 +31,9 @@ @interface NCStatisticsStreamEntryValueTransformer : NSValueTransformer
 
 //******************************************************************************
 @interface NCStatisticsWindowController ()
+{
+    StatisticsStorage::StatRepo _prevStat;
+}
 
 @property (nonatomic) NSString *username;
 @property (nonatomic) NSString *hubPrefix;
@@ -43,6 +47,8 @@ @interface NCStatisticsWindowController ()
 @property (nonatomic) NSTimer *statUpdateTimer;
 @property (nonatomic) NSString *activeThread;
 @property (weak) IBOutlet NSTextField *outRateEstimationLabel;
+@property (nonatomic) unsigned int refreshRate;
+@property (nonatomic) NSDictionary *rateMeters;
 
 @property (nonatomic) double nBytesPerSec, interestFrequency, segmentsFrequency;
 @property (nonatomic) double rttEstimation;
@@ -87,6 +93,9 @@ -(id)init
     
     if (self)
     {
+        for (auto it:StatisticsStorage::IndicatorKeywords)
+            _prevStat[it.first] = 0.;
+        
         self.activeStreamPrefix = nil;
         self.streamPrefixLock = [[NSLock alloc] init];
         self.chartsView.alphaValue = 0;
@@ -307,6 +316,13 @@ -(void)onFetchedStreamsChanged:(NSNotification*)notification
 -(void)startStatUpdate:(NSTimeInterval)refreshRate
 {
     __weak NCStatisticsWindowController *weakSelf = self;
+    self.refreshRate = refreshRate;
+    self.rateMeters = @{
+                        @"incomingRate" : [[NSMutableArray alloc] initCircularArrayWithSize:refreshRate],
+                        @"irate" : [[NSMutableArray alloc] initCircularArrayWithSize:refreshRate],
+                        @"srate" : [[NSMutableArray alloc] initCircularArrayWithSize:refreshRate],
+                        @"rtxRate" : [[NSMutableArray alloc] initCircularArrayWithSize:refreshRate]
+                         };
     self.statUpdateTimer = [NSTimer scheduledTimerWithTimeInterval:(1./refreshRate)
                                                            repeats:YES
                                                          fireBlock:^(NSTimer *timer) {
@@ -336,9 +352,12 @@ -(void)queryStatisticsForStream:(NSString*)aStreamPrefix
         std::string threadName = libHandle->getStreamThread(streamPrefix);
         self.activeThread = [NSString ncStringFromCString:threadName.c_str()];
         
-        self.nBytesPerSec = stat[Indicator::InBitrateKbps];
-        self.interestFrequency = stat[Indicator::InterestRate];
-        self.segmentsFrequency = stat[Indicator::InRateSegments];
+        [self.rateMeters[@"incomingRate"] push:@((stat[Indicator::RawBytesReceived] - _prevStat[Indicator::RawBytesReceived]))];
+        self.nBytesPerSec = [self.rateMeters[@"incomingRate"] average]*self.refreshRate*8/1000;
+        [self.rateMeters[@"irate"] push:@((stat[Indicator::InterestsSentNum] - _prevStat[Indicator::InterestsSentNum]))];
+        self.interestFrequency = [self.rateMeters[@"irate"] average]*(double)self.refreshRate;
+        [self.rateMeters[@"srate"] push:@((stat[Indicator::SegmentsReceivedNum] - _prevStat[Indicator::SegmentsReceivedNum]))];
+        self.segmentsFrequency = [self.rateMeters[@"srate"] average]*(double)self.refreshRate;
         self.rttEstimation = stat[Indicator::RttEstimation];
         self.jitterEstimationMs = stat[Indicator::BufferEstimatedSize];
         self.jitterPlayableMs = stat[Indicator::BufferPlayableSize];
@@ -372,7 +391,7 @@ -(void)queryStatisticsForStream:(NSString*)aStreamPrefix
         self.avgSegNumKey = stat[Indicator::SegmentsKeyAvgNum];
         self.avgSegNumParity = stat[Indicator::SegmentsDeltaParityAvgNum];
         self.avgSegNumParityKey = stat[Indicator::SegmentsKeyParityAvgNum];
-        self.rtxFreq = stat[Indicator::RtxFrequency];
+        self.rtxFreq = [self.rateMeters[@"rtxRate"] average]*(double)self.refreshRate;
         self.nRtx = stat[Indicator::RtxNum];
         self.nRebuffer = stat[Indicator::RebufferingsNum];
         self.nRequested = stat[Indicator::RequestedNum];
@@ -386,7 +405,10 @@ -(void)queryStatisticsForStream:(NSString*)aStreamPrefix
         double allSkipped = self.nSkippedIncomplete+self.nSkippedInvalidGop+self.nSkippedNoKey;
         self.playbackEfficiency = round(allSkipped/(double)self.nPlayed*10000)/100;
         
-        self.outRateEstimationLabel.stringValue = [[NSNumber numberWithDouble:(INTEREST_AVERAGE_SIZE_BYTES*stat[Indicator::InterestRate]*8/1000.)] stringValue];
+        self.outRateEstimationLabel.stringValue = [[NSNumber numberWithDouble:(INTEREST_AVERAGE_SIZE_BYTES*self.interestFrequency*8/1000.)] stringValue];
+
+        _prevStat = stat.getIndicators();
+        
     }
 }
 
diff --git a/ndncon/NSArray+NCAdditions.h b/ndncon/NSArray+NCAdditions.h
index 9a1cfda..25267dc 100755
--- a/ndncon/NSArray+NCAdditions.h
+++ b/ndncon/NSArray+NCAdditions.h
@@ -26,3 +26,15 @@
 -(NSDictionary*)threadWithName:(NSString*)threadName;
 
 @end
+
+@interface NSMutableArray (NCCircularArray)
+
+@property (nonatomic) unsigned int circularBufferSize;
+@property (nonatomic) unsigned int currentIndex;
+
+-(instancetype)initCircularArrayWithSize:(unsigned int)size;
+
+-(void)push:(id)object;
+-(float)average;
+
+@end
diff --git a/ndncon/NSArray+NCAdditions.m b/ndncon/NSArray+NCAdditions.m
index 490326c..64c8b87 100755
--- a/ndncon/NSArray+NCAdditions.m
+++ b/ndncon/NSArray+NCAdditions.m
@@ -6,6 +6,19 @@
 //  Copyright 2013-2015 Regents of the University of California.
 //
 
+// from http://stackoverflow.com/questions/8733104/objective-c-property-instance-variable-in-category
+#define CATEGORY_PROPERTY_GET(type, property) - (type) property { return objc_getAssociatedObject(self, @selector(property)); }
+#define CATEGORY_PROPERTY_SET(type, property, setter) - (void) setter (type) property { objc_setAssociatedObject(self, @selector(property), property, OBJC_ASSOCIATION_RETAIN_NONATOMIC); }
+#define CATEGORY_PROPERTY_GET_SET(type, property, setter) CATEGORY_PROPERTY_GET(type, property) CATEGORY_PROPERTY_SET(type, property, setter)
+
+#define CATEGORY_PROPERTY_GET_NSNUMBER_PRIMITIVE(type, property, valueSelector) - (type) property { return [objc_getAssociatedObject(self, @selector(property)) valueSelector]; }
+#define CATEGORY_PROPERTY_SET_NSNUMBER_PRIMITIVE(type, property, setter, numberSelector) - (void) setter (type) property { objc_setAssociatedObject(self, @selector(property), [NSNumber numberSelector: property], OBJC_ASSOCIATION_RETAIN_NONATOMIC); }
+
+#define CATEGORY_PROPERTY_GET_UINT(property) CATEGORY_PROPERTY_GET_NSNUMBER_PRIMITIVE(unsigned int, property, unsignedIntValue)
+#define CATEGORY_PROPERTY_SET_UINT(property, setter) CATEGORY_PROPERTY_SET_NSNUMBER_PRIMITIVE(unsigned int, property, setter, numberWithUnsignedInt)
+#define CATEGORY_PROPERTY_GET_SET_UINT(property, setter) CATEGORY_PROPERTY_GET_UINT(property) CATEGORY_PROPERTY_SET_UINT(property, setter)
+
+#import <objc/runtime.h>
 #import "NSArray+NCAdditions.h"
 #import "NSDictionary+NCAdditions.h"
 
@@ -97,3 +110,35 @@ -(NSDictionary *)threadWithName:(NSString *)threadName
 }
 
 @end
+
+@implementation NSMutableArray (NCCircularArray)
+
+CATEGORY_PROPERTY_GET_SET_UINT(circularBufferSize, setCircularBufferSize:)
+CATEGORY_PROPERTY_GET_SET_UINT(currentIndex, setCurrentIndex:)
+
+-(instancetype)initCircularArrayWithSize:(unsigned int)size
+{
+    self = [self init];
+    self.circularBufferSize = size;
+    self.currentIndex = 0;
+    
+    return self;
+}
+
+-(void)push:(id)object
+{
+    if (self.currentIndex == self.circularBufferSize)
+        self.currentIndex = 0;
+    
+    [self insertObject:object atIndex:self.currentIndex++];
+    
+    if (self.count > self.circularBufferSize)
+        [self removeObjectAtIndex:self.currentIndex];
+}
+
+-(float)average
+{
+    return [[self valueForKeyPath:@"@avg.floatValue"] floatValue];
+}
+
+@end