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stddev.h

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#ifndef STDDEV_H_
#define STDDEV_H_

class stddev
{
private:
  stddev( const stddev &rhs );

  double mean_;
  double calc_mean_( const double *v, const size_t N);
public:
  stddev() { mean_ = 0;}
  ~stddev() {}

  double mean() { return mean_; }
  double sd( const double *v, 
             const size_t N );

  double sd( const double *v, 
             const size_t N, 
             const double mean );
};

#endif

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