marlin::ErrorOfSigma Class Reference

Small helper class that computes the lower and upper error of sigma assuming a normal distribution, i.e. More...

#include <ErrorOfSigma.h>

Public Member Functions
	ErrorOfSigma (unsigned n)
	C'tor takes the number of measured values. More...
virtual	~ErrorOfSigma ()
	Virtual d'tor. More...
double	lowerError (double sigma)
	The lower error of sigma. More...
double	upperError (double sigma)
	The upper error of sigma. More...

Protected Member Functions
virtual double	getChiSquaredPlus ()
	Returns the chisquared value with P(chisquared) == 0.84. More...
virtual double	getChiSquaredMinus ()
	Returns the chisquared value with P(chisquared) == 0.16. More...

Protected Attributes
unsigned	_n
	The number of degrees of freedom. More...

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.

Constructor & Destructor Documentation

marlin::ErrorOfSigma::ErrorOfSigma

(

unsigned

n

)

C'tor takes the number of measured values.

Definition at line 10 of file ErrorOfSigma.cc.

References std::endl().

virtual marlin::ErrorOfSigma::~ErrorOfSigma ( )

inlinevirtual

Virtual d'tor.

Definition at line 22 of file ErrorOfSigma.h.

Member Function Documentation

double marlin::ErrorOfSigma::getChiSquaredMinus ( )

protectedvirtual

Returns the chisquared value with P(chisquared) == 0.16.

Definition at line 56 of file ErrorOfSigma.cc.

References _n, std::pow(), and std::sqrt().

Referenced by upperError().

double marlin::ErrorOfSigma::getChiSquaredPlus ( )

protectedvirtual

Returns the chisquared value with P(chisquared) == 0.84.

Definition at line 37 of file ErrorOfSigma.cc.

References _n, std::pow(), and std::sqrt().

Referenced by lowerError().

double marlin::ErrorOfSigma::lowerError

(

double

sigma

)

The lower error of sigma.

Definition at line 24 of file ErrorOfSigma.cc.

References _n, getChiSquaredPlus(), and std::sqrt().

double marlin::ErrorOfSigma::upperError

(

double

sigma

)

The upper error of sigma.

Definition at line 30 of file ErrorOfSigma.cc.

References _n, getChiSquaredMinus(), and std::sqrt().

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:

• /afs/desy.de/user/d/dudarboh/iLCSoft/Marlin/source/include/marlin/ErrorOfSigma.h
• /afs/desy.de/user/d/dudarboh/iLCSoft/Marlin/source/src/ErrorOfSigma.cc