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00001 #ifndef Statistics_Accumulator_h 00002 #define Statistics_Accumulator_h 00003 00009 #include <iosfwd> 00010 #include<cmath> 00011 00012 class Accumulator 00013 { 00014 public: 00015 Accumulator(); 00016 00017 void addEntry(double value, double weight=1.); 00018 00019 double mean() const; 00020 00021 double variance() const; 00022 00023 double sigma() const {return std::sqrt(variance());} 00024 00025 double weightedMean() const; 00026 00027 unsigned long nEntries() const {return n_;} 00028 00029 private: 00030 double sum_; 00031 double sumOfSquares_; 00032 double weightedSum_; 00033 double sumOfWeights_; 00034 unsigned long n_; 00035 }; 00036 00037 std::ostream & operator<<(std::ostream & os, const Accumulator & stat); 00038 00039 #endif 00040
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