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#ifndef Statistics_Accumulator_h
#define Statistics_Accumulator_h
/** For validation purposes. This program
calculates mean and RMS of a distribution
\Author Rick Wilkinson
*/
#include <iosfwd>
#include <cmath>
class Accumulator {
public:
Accumulator();
void addEntry(double value, double weight = 1.);
double mean() const;
double variance() const;
double sigma() const { return std::sqrt(variance()); }
double weightedMean() const;
unsigned long nEntries() const { return n_; }
private:
double sum_;
double sumOfSquares_;
double weightedSum_;
double sumOfWeights_;
unsigned long n_;
};
std::ostream& operator<<(std::ostream& os, const Accumulator& stat);
#endif
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