marlin::ErrorOfSigma Class Reference

#include <ErrorOfSigma.h>

List of all members.

Public Member Functions
	ErrorOfSigma (unsigned n)
virtual	~ErrorOfSigma ()
double	lowerError (double sigma)
double	upperError (double sigma)
Protected Member Functions
virtual double	getChiSquaredPlus ()
virtual double	getChiSquaredMinus ()
Protected Attributes
unsigned	_n

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Detailed Description

Small helper class that computes the lower and upper error of sigma assuming a normal distribution, i.e. sigma has been computed as sigma = 1. / (n-1) * SUM_i_n( x_i - a_i )**2.

Author:

F. Gaede, DESY

Version:

Id

ErrorOfSigma.h,v 1.2 2005/10/11 12:56:28 gaede Exp

Definition at line 13 of file ErrorOfSigma.h.

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Constructor & Destructor Documentation

marlin::ErrorOfSigma::ErrorOfSigma (  unsigned  n  )

C'tor takes the number of measured values. Definition at line 7 of file ErrorOfSigma.cc.

virtual marlin::ErrorOfSigma::~ErrorOfSigma (   )  [inline, virtual]

Virtual d'tor. Definition at line 22 of file ErrorOfSigma.h.

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Member Function Documentation

double marlin::ErrorOfSigma::getChiSquaredMinus (   )  [protected, virtual]

Returns the chisquared value with P(chisquared) == 0.16 Definition at line 53 of file ErrorOfSigma.cc. References _n. Referenced by upperError().

double marlin::ErrorOfSigma::getChiSquaredPlus (   )  [protected, virtual]

Returns the chisquared value with P(chisquared) == 0.84 Definition at line 34 of file ErrorOfSigma.cc. References _n. Referenced by lowerError().

double marlin::ErrorOfSigma::lowerError (  double  sigma  )

The lower error of sigma Definition at line 21 of file ErrorOfSigma.cc. References _n, and getChiSquaredPlus().

double marlin::ErrorOfSigma::upperError (  double  sigma  )

The upper error of sigma Definition at line 27 of file ErrorOfSigma.cc. References _n, and getChiSquaredMinus().

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Member Data Documentation

unsigned marlin::ErrorOfSigma::_n [protected]

The number of degrees of freedom Definition at line 43 of file ErrorOfSigma.h. Referenced by getChiSquaredMinus(), getChiSquaredPlus(), lowerError(), and upperError().

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The documentation for this class was generated from the following files:

• include/marlin/ErrorOfSigma.h
• src/marlin/ErrorOfSigma.cc
• include/tpc_tracking/marlin/ErrorOfSigma.cc

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