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vpStatisticalTestEWMA Class Reference
core: Core module » Mathematics » Other tools

#include <visp3/core/vpStatisticalTestEWMA.h>

+ Inheritance diagram for vpStatisticalTestEWMA:

Public Types

enum  vpMeanDriftType {
  MEAN_DRIFT_NONE = 0 , MEAN_DRIFT_DOWNWARD = 1 , MEAN_DRIFT_UPWARD = 2 , MEAN_DRIFT_BOTH = 3 ,
  MEAN_DRIFT_COUNT = 4 , MEAN_DRIFT_UNKNOWN = MEAN_DRIFT_COUNT
}
 
typedef enum vpStatisticalTestAbstract::vpMeanDriftType vpMeanDriftType
 

Public Member Functions

 vpStatisticalTestEWMA (const float &alpha=0.1f)
 
float getAlpha () const
 
float getWt () const
 
void init (const float &alpha)
 
void init (const float &alpha, const float &mean, const float &stdev)
 
void setAlpha (const float &alpha)
 
void getLimits (float &limitDown, float &limitUp) const
 
float getMean () const
 
float getStdev () const
 
void init ()
 
void setMinStdev (const float &stdevmin)
 
void setNbSamplesForStat (const unsigned int &nbSamples)
 
vpMeanDriftType testDownUpwardMeanDrift (const float &signal)
 
vpMeanDriftType testDownwardMeanDrift (const float &signal)
 
vpMeanDriftType testUpwardMeanDrift (const float &signal)
 

Static Public Member Functions

static std::string vpMeanDriftTypeToString (const vpMeanDriftType &type)
 
static vpMeanDriftType vpMeanDriftTypeFromString (const std::string &name)
 
static std::string getAvailableMeanDriftType (const std::string &prefix="<", const std::string &sep=" , ", const std::string &suffix=">")
 
static void print (const vpMeanDriftType &type)
 

Protected Member Functions

virtual void computeDeltaAndLimits ()
 
virtual vpMeanDriftType detectDownwardMeanDrift () override
 
virtual vpMeanDriftType detectUpwardMeanDrift () override
 
virtual bool updateStatistics (const float &signal) override
 
virtual void updateTestSignals (const float &signal) override
 

Protected Attributes

float m_alpha
 
float m_wt
 
float m_wtprev
 
bool m_areStatisticsComputed
 
float m_count
 
float m_limitDown
 
float m_limitUp
 
float m_mean
 
unsigned int m_nbSamplesForStatistics
 
float * m_s
 
float m_stdev
 
float m_stdevmin
 
float m_sumForMean
 

Detailed Description

Class that permits to perform Exponentially Weighted Moving Average mean drft tests.

The EWMA test is designed to detect drift in the mean $ \mu $ of an observed signal $ s(t) $.

The test signal $ w(t) $ is computed as follow:

$ w(0) = \mu $

$ w(t) = \alpha s(t) + ( 1 - \alpha ) * w(t-1) $

Be $ \sigma $ the standard deviation of the input signal $ s(t) $.

A downward alarm is raised if: $ w(t) <= \mu - 3 * \sigma * \sqrt{ \frac{\alpha}{2 - \alpha}}$

An upward alarm is raised if: $ w(t) >= \mu + 3 * \sigma * \sqrt{ \frac{\alpha}{2 - \alpha}}$

To detect only downward drifts of the input signal $ s(t) $ use testDownwardMeanDrift().To detect only upward drifts in $ s(t) $ use testUpwardMeanDrift(). To detect both, downward and upward drifts use testDownUpwardMeanDrift().

Examples
testSPC.cpp, and tutorial-meandrift.cpp.

Definition at line 71 of file vpStatisticalTestEWMA.h.

Member Typedef Documentation

◆ vpMeanDriftType

typedef enum vpStatisticalTestAbstract::vpMeanDriftType vpStatisticalTestAbstract::vpMeanDriftType
inherited

Enum that indicates if a drift of the mean occurred.

Member Enumeration Documentation

◆ vpMeanDriftType

enum vpStatisticalTestAbstract::vpMeanDriftType
inherited

Enum that indicates if a drift of the mean occurred.

Enumerator
MEAN_DRIFT_NONE 

No mean drift occurred

MEAN_DRIFT_DOWNWARD 

A downward drift of the mean occurred.

MEAN_DRIFT_UPWARD 

An upward drift of the mean occurred.

MEAN_DRIFT_BOTH 

Both an aupward and a downward drifts occurred.

MEAN_DRIFT_COUNT 
MEAN_DRIFT_UNKNOWN 

Definition at line 63 of file vpStatisticalTestAbstract.h.

Constructor & Destructor Documentation

◆ vpStatisticalTestEWMA()

vpStatisticalTestEWMA::vpStatisticalTestEWMA ( const float &  alpha = 0.1f)

Construct a new vpStatisticalTestEWMA object.

Parameters
[in]alphaThe forgetting factor.

Definition at line 90 of file vpStatisticalTestEWMA.cpp.

References vpStatisticalTestAbstract::init().

Member Function Documentation

◆ computeDeltaAndLimits()

BEGIN_VISP_NAMESPACE void vpStatisticalTestEWMA::computeDeltaAndLimits ( )
protectedvirtual

Compute the upper and lower limits of the test signal.

Definition at line 42 of file vpStatisticalTestEWMA.cpp.

References m_alpha, vpStatisticalTestAbstract::m_limitDown, vpStatisticalTestAbstract::m_limitUp, vpStatisticalTestAbstract::m_mean, and vpStatisticalTestAbstract::m_stdev.

Referenced by init(), and updateStatistics().

◆ detectDownwardMeanDrift()

vpStatisticalTestAbstract::vpMeanDriftType vpStatisticalTestEWMA::detectDownwardMeanDrift ( )
overrideprotectedvirtual

Detects if a downward mean drift occurred.

Returns
vpMeanDriftType::MEAN_DRIFT_DOWNWARD if a downward mean drift occurred, vpMeanDriftType::MEAN_DRIFT_NONE otherwise.
See also
detectUpwardMeanDrift()

Implements vpStatisticalTestAbstract.

Definition at line 49 of file vpStatisticalTestEWMA.cpp.

References vpStatisticalTestAbstract::m_limitDown, m_wt, vpStatisticalTestAbstract::MEAN_DRIFT_DOWNWARD, and vpStatisticalTestAbstract::MEAN_DRIFT_NONE.

◆ detectUpwardMeanDrift()

vpStatisticalTestAbstract::vpMeanDriftType vpStatisticalTestEWMA::detectUpwardMeanDrift ( )
overrideprotectedvirtual

Detects if an upward mean drift occurred on the mean.

Returns
vpMeanDriftType::MEAN_DRIFT_UPWARD if an upward mean drift occurred, vpMeanDriftType::MEAN_DRIFT_NONE otherwise.
See also
detectDownwardMeanDrift()

Implements vpStatisticalTestAbstract.

Definition at line 59 of file vpStatisticalTestEWMA.cpp.

References vpStatisticalTestAbstract::m_limitUp, m_wt, vpStatisticalTestAbstract::MEAN_DRIFT_NONE, and vpStatisticalTestAbstract::MEAN_DRIFT_UPWARD.

◆ getAlpha()

float vpStatisticalTestEWMA::getAlpha ( ) const
inline

Get the forgetting factor of the algorithm.

Returns
float The forgetting factor.

Definition at line 145 of file vpStatisticalTestEWMA.h.

◆ getAvailableMeanDriftType()

std::string vpStatisticalTestAbstract::getAvailableMeanDriftType ( const std::string &  prefix = "<",
const std::string &  sep = " , ",
const std::string &  suffix = ">" 
)
staticinherited

Get the list of available vpMeanDriftType objects that are handled.

Parameters
[in]prefixThe prefix that should be placed before the list.
[in]sepThe separator between each element of the list.
[in]suffixThe suffix that should terminate the list.
Returns
std::string The list of handled type of process tests, presented as a string.
Examples
tutorial-meandrift.cpp.

Definition at line 82 of file vpStatisticalTestAbstract.cpp.

References vpStatisticalTestAbstract::MEAN_DRIFT_COUNT, and vpStatisticalTestAbstract::vpMeanDriftTypeToString().

◆ getLimits()

void vpStatisticalTestAbstract::getLimits ( float &  limitDown,
float &  limitUp 
) const
inlineinherited

Get the upper and lower limits of the test signal.

Parameters
[out]limitDownThe lower limit.
[out]limitUpThe upper limit.
Examples
testSPC.cpp, and tutorial-meandrift.cpp.

Definition at line 175 of file vpStatisticalTestAbstract.h.

◆ getMean()

float vpStatisticalTestAbstract::getMean ( ) const
inlineinherited

Get the mean used as reference.

Returns
float The mean.
Examples
tutorial-meandrift.cpp.

Definition at line 186 of file vpStatisticalTestAbstract.h.

◆ getStdev()

float vpStatisticalTestAbstract::getStdev ( ) const
inlineinherited

Get the standard deviation used as reference.

Returns
float The standard deviation.
Examples
tutorial-meandrift.cpp.

Definition at line 196 of file vpStatisticalTestAbstract.h.

◆ getWt()

float vpStatisticalTestEWMA::getWt ( ) const
inline

Get the current value of the test signal.

Returns
float The current value of the test signal.
Examples
tutorial-meandrift.cpp.

Definition at line 155 of file vpStatisticalTestEWMA.h.

◆ init() [1/3]

void vpStatisticalTestAbstract::init ( )
inherited

(Re)Initialize the algorithm.

Definition at line 154 of file vpStatisticalTestAbstract.cpp.

References vpStatisticalTestAbstract::m_areStatisticsComputed, vpStatisticalTestAbstract::m_count, vpStatisticalTestAbstract::m_limitDown, vpStatisticalTestAbstract::m_limitUp, vpStatisticalTestAbstract::m_mean, vpStatisticalTestAbstract::m_nbSamplesForStatistics, vpStatisticalTestAbstract::m_s, vpStatisticalTestAbstract::m_stdev, and vpStatisticalTestAbstract::m_sumForMean.

Referenced by vpStatisticalTestHinkley::init(), vpStatisticalTestShewhart::init(), init(), vpStatisticalTestMeanAdjustedCUSUM::init(), vpStatisticalTestSigma::init(), setAlpha(), vpStatisticalTestEWMA(), vpStatisticalTestMeanAdjustedCUSUM::vpStatisticalTestMeanAdjustedCUSUM(), vpStatisticalTestShewhart::vpStatisticalTestShewhart(), and vpStatisticalTestSigma::vpStatisticalTestSigma().

◆ init() [2/3]

void vpStatisticalTestEWMA::init ( const float &  alpha)

Initialize the EWMA algorithm.

Parameters
[in]alphaThe forgetting factor.

Definition at line 99 of file vpStatisticalTestEWMA.cpp.

References vpStatisticalTestAbstract::init(), m_alpha, m_wt, m_wtprev, and vpStatisticalTestAbstract::setNbSamplesForStat().

◆ init() [3/3]

void vpStatisticalTestEWMA::init ( const float &  alpha,
const float &  mean,
const float &  stdev 
)

Initialize the EWMA algorithm.

Parameters
[in]alphaThe forgetting factor.
[in]meanThe expected mean of the signal to monitor.
[in]stdevThe expected standard deviation of the signal to monitor.

Definition at line 109 of file vpStatisticalTestEWMA.cpp.

References computeDeltaAndLimits(), vpStatisticalTestAbstract::init(), m_alpha, vpStatisticalTestAbstract::m_areStatisticsComputed, vpStatisticalTestAbstract::m_mean, vpStatisticalTestAbstract::m_stdev, m_wt, m_wtprev, and vpStatisticalTestAbstract::setNbSamplesForStat().

◆ print()

void vpStatisticalTestAbstract::print ( const vpMeanDriftType &  type)
staticinherited

Print the message corresponding to the type of mean drift.

Parameters
[in]typeThe type of mean drift.

Definition at line 95 of file vpStatisticalTestAbstract.cpp.

References vpStatisticalTestAbstract::vpMeanDriftTypeToString().

◆ setAlpha()

void vpStatisticalTestEWMA::setAlpha ( const float &  alpha)

Set the forgetting factor.

Parameters
[in]alphaThe forgetting factor.

Definition at line 125 of file vpStatisticalTestEWMA.cpp.

References vpStatisticalTestAbstract::init().

◆ setMinStdev()

void vpStatisticalTestAbstract::setMinStdev ( const float &  stdevmin)
inlineinherited

Set the minimum value of the standard deviation that is expected. The computed standard deviation cannot be lower this value if set.

Parameters
[in]stdevminThe minimum value of the standard deviation that is expected.

Definition at line 220 of file vpStatisticalTestAbstract.h.

◆ setNbSamplesForStat()

void vpStatisticalTestAbstract::setNbSamplesForStat ( const unsigned int &  nbSamples)
inherited

Set the number of samples required to compute the mean and standard deviation of the signal and allocate the memory accordingly.

Parameters
[in]nbSamplesThe number of samples we want to use.

Definition at line 190 of file vpStatisticalTestAbstract.cpp.

References vpStatisticalTestAbstract::m_nbSamplesForStatistics, and vpStatisticalTestAbstract::m_s.

Referenced by vpStatisticalTestHinkley::init(), init(), vpStatisticalTestMeanAdjustedCUSUM::init(), vpStatisticalTestSigma::init(), and vpStatisticalTestAbstract::operator=().

◆ testDownUpwardMeanDrift()

vpStatisticalTestAbstract::vpMeanDriftType vpStatisticalTestAbstract::testDownUpwardMeanDrift ( const float &  signal)
inherited

Test if a downward or an upward mean drift occurred according to the new value of the signal.

Parameters
[in]signalThe new value of the signal.
Returns
vpMeanDriftType The type of mean drift that occurred.
See also
testDownwardMeanDrift() testUpwardMeanDrift()
Examples
testSPC.cpp, and tutorial-meandrift.cpp.

Definition at line 199 of file vpStatisticalTestAbstract.cpp.

References vpStatisticalTestAbstract::detectDownwardMeanDrift(), vpStatisticalTestAbstract::detectUpwardMeanDrift(), vpStatisticalTestAbstract::m_areStatisticsComputed, vpStatisticalTestAbstract::MEAN_DRIFT_BOTH, vpStatisticalTestAbstract::MEAN_DRIFT_NONE, vpStatisticalTestAbstract::updateStatistics(), and vpStatisticalTestAbstract::updateTestSignals().

◆ testDownwardMeanDrift()

vpStatisticalTestAbstract::vpMeanDriftType vpStatisticalTestAbstract::testDownwardMeanDrift ( const float &  signal)
inherited

Test if a downward mean drift occurred according to the new value of the signal.

Parameters
[in]signalThe new value of the signal.
Returns
vpMeanDriftType The type of mean drift that occurred.
See also
testUpwardMeanDrift()

Definition at line 224 of file vpStatisticalTestAbstract.cpp.

References vpStatisticalTestAbstract::detectDownwardMeanDrift(), vpStatisticalTestAbstract::m_areStatisticsComputed, vpStatisticalTestAbstract::MEAN_DRIFT_NONE, vpStatisticalTestAbstract::updateStatistics(), and vpStatisticalTestAbstract::updateTestSignals().

◆ testUpwardMeanDrift()

vpStatisticalTestAbstract::vpMeanDriftType vpStatisticalTestAbstract::testUpwardMeanDrift ( const float &  signal)
inherited

Test if an upward mean drift occurred according to the new value of the signal.

Parameters
[in]signalThe new value of the signal.
Returns
vpMeanDriftType The type of mean drift that occurred.
See also
testDownwardMeanDrift()

Definition at line 236 of file vpStatisticalTestAbstract.cpp.

References vpStatisticalTestAbstract::detectUpwardMeanDrift(), vpStatisticalTestAbstract::m_areStatisticsComputed, vpStatisticalTestAbstract::MEAN_DRIFT_NONE, vpStatisticalTestAbstract::updateStatistics(), and vpStatisticalTestAbstract::updateTestSignals().

◆ updateStatistics()

bool vpStatisticalTestEWMA::updateStatistics ( const float &  signal)
overrideprotectedvirtual

Update m_s and if enough values are available, compute the mean, the standard deviation and the limits.

Parameters
[in]signalThe new value of the signal to monitor.

Reimplemented from vpStatisticalTestAbstract.

Definition at line 69 of file vpStatisticalTestEWMA.cpp.

References computeDeltaAndLimits(), vpStatisticalTestAbstract::m_mean, m_wt, and vpStatisticalTestAbstract::updateStatistics().

◆ updateTestSignals()

void vpStatisticalTestEWMA::updateTestSignals ( const float &  signal)
overrideprotectedvirtual

Update the test signals.

Parameters
[in]signalThe new value of the signal to monitor.

Implements vpStatisticalTestAbstract.

Definition at line 82 of file vpStatisticalTestEWMA.cpp.

References m_alpha, m_wt, and m_wtprev.

◆ vpMeanDriftTypeFromString()

vpStatisticalTestAbstract::vpMeanDriftType vpStatisticalTestAbstract::vpMeanDriftTypeFromString ( const std::string &  name)
staticinherited

Cast a string into a vpMeanDriftType.

Parameters
[in]nameThe name of the mean drift.
Returns
vpMeanDriftType The corresponding vpMeanDriftType.
Examples
tutorial-meandrift.cpp.

Definition at line 65 of file vpStatisticalTestAbstract.cpp.

References vpStatisticalTestAbstract::MEAN_DRIFT_COUNT, vpStatisticalTestAbstract::MEAN_DRIFT_UNKNOWN, and vpStatisticalTestAbstract::vpMeanDriftTypeToString().

◆ vpMeanDriftTypeToString()

BEGIN_VISP_NAMESPACE std::string vpStatisticalTestAbstract::vpMeanDriftTypeToString ( const vpMeanDriftType &  type)
staticinherited

Cast a vpMeanDriftType into a string.

Parameters
[in]typeThe type of mean drift.
Returns
std::string The corresponding message.
Examples
testSPC.cpp, and tutorial-meandrift.cpp.

Definition at line 41 of file vpStatisticalTestAbstract.cpp.

References vpStatisticalTestAbstract::MEAN_DRIFT_BOTH, vpStatisticalTestAbstract::MEAN_DRIFT_DOWNWARD, vpStatisticalTestAbstract::MEAN_DRIFT_NONE, vpStatisticalTestAbstract::MEAN_DRIFT_UNKNOWN, and vpStatisticalTestAbstract::MEAN_DRIFT_UPWARD.

Referenced by vpStatisticalTestAbstract::getAvailableMeanDriftType(), vpStatisticalTestAbstract::print(), and vpStatisticalTestAbstract::vpMeanDriftTypeFromString().

Member Data Documentation

◆ m_alpha

float vpStatisticalTestEWMA::m_alpha
protected

Forgetting factor: the higher, the more weight the current signal value has.

Definition at line 74 of file vpStatisticalTestEWMA.h.

Referenced by computeDeltaAndLimits(), init(), and updateTestSignals().

◆ m_areStatisticsComputed

bool vpStatisticalTestAbstract::m_areStatisticsComputed
protectedinherited

Set to true once the mean and the standard deviation are available.

Definition at line 108 of file vpStatisticalTestAbstract.h.

Referenced by vpStatisticalTestAbstract::init(), vpStatisticalTestShewhart::init(), vpStatisticalTestHinkley::init(), init(), vpStatisticalTestMeanAdjustedCUSUM::init(), vpStatisticalTestSigma::init(), vpStatisticalTestAbstract::operator=(), vpStatisticalTestAbstract::testDownUpwardMeanDrift(), vpStatisticalTestAbstract::testDownwardMeanDrift(), vpStatisticalTestAbstract::testUpwardMeanDrift(), vpStatisticalTestAbstract::updateStatistics(), and vpStatisticalTestHinkley::updateStatistics().

◆ m_count

float vpStatisticalTestAbstract::m_count
protectedinherited

Current number of data used to compute the mean and the standard deviation.

Definition at line 109 of file vpStatisticalTestAbstract.h.

Referenced by vpStatisticalTestHinkley::computeMean(), vpStatisticalTestAbstract::init(), vpStatisticalTestAbstract::operator=(), vpStatisticalTestAbstract::updateStatistics(), and vpStatisticalTestHinkley::updateTestSignals().

◆ m_limitDown

float vpStatisticalTestAbstract::m_limitDown
protectedinherited

Upper limit for the test signal m_wt.

Definition at line 110 of file vpStatisticalTestAbstract.h.

Referenced by computeDeltaAndLimits(), vpStatisticalTestSigma::computeLimits(), vpStatisticalTestShewhart::computeLimits(), detectDownwardMeanDrift(), vpStatisticalTestMeanAdjustedCUSUM::detectDownwardMeanDrift(), vpStatisticalTestShewhart::detectDownwardMeanDrift(), vpStatisticalTestSigma::detectDownwardMeanDrift(), vpStatisticalTestAbstract::init(), vpStatisticalTestAbstract::operator=(), vpStatisticalTestHinkley::setAlpha(), and vpStatisticalTestMeanAdjustedCUSUM::updateStatistics().

◆ m_limitUp

float vpStatisticalTestAbstract::m_limitUp
protectedinherited

Lower limit for the test signal m_wt

Definition at line 111 of file vpStatisticalTestAbstract.h.

Referenced by computeDeltaAndLimits(), vpStatisticalTestSigma::computeLimits(), vpStatisticalTestShewhart::computeLimits(), detectUpwardMeanDrift(), vpStatisticalTestMeanAdjustedCUSUM::detectUpwardMeanDrift(), vpStatisticalTestShewhart::detectUpwardMeanDrift(), vpStatisticalTestSigma::detectUpwardMeanDrift(), vpStatisticalTestAbstract::init(), vpStatisticalTestAbstract::operator=(), vpStatisticalTestHinkley::setAlpha(), and vpStatisticalTestMeanAdjustedCUSUM::updateStatistics().

◆ m_mean

float vpStatisticalTestAbstract::m_mean
protectedinherited

Mean of the monitored signal.

Definition at line 112 of file vpStatisticalTestAbstract.h.

Referenced by computeDeltaAndLimits(), vpStatisticalTestSigma::computeLimits(), vpStatisticalTestShewhart::computeLimits(), vpStatisticalTestHinkley::computeMean(), vpStatisticalTestHinkley::computeSk(), vpStatisticalTestHinkley::computeTk(), vpStatisticalTestShewhart::detectDownwardMeanDrift(), vpStatisticalTestShewhart::detectUpwardMeanDrift(), vpStatisticalTestAbstract::init(), vpStatisticalTestShewhart::init(), vpStatisticalTestHinkley::init(), init(), vpStatisticalTestMeanAdjustedCUSUM::init(), vpStatisticalTestSigma::init(), vpStatisticalTestAbstract::operator=(), vpStatisticalTestAbstract::updateStatistics(), updateStatistics(), and vpStatisticalTestMeanAdjustedCUSUM::updateTestSignals().

◆ m_nbSamplesForStatistics

unsigned int vpStatisticalTestAbstract::m_nbSamplesForStatistics
protectedinherited

Number of samples to use to compute the mean and the standard deviation.

Definition at line 113 of file vpStatisticalTestAbstract.h.

Referenced by vpStatisticalTestAbstract::init(), vpStatisticalTestAbstract::operator=(), vpStatisticalTestAbstract::setNbSamplesForStat(), and vpStatisticalTestAbstract::updateStatistics().

◆ m_s

float* vpStatisticalTestAbstract::m_s
protectedinherited

Array that keeps the samples used to compute the mean and standard deviation.

Definition at line 114 of file vpStatisticalTestAbstract.h.

Referenced by vpStatisticalTestSigma::getSignal(), vpStatisticalTestAbstract::init(), vpStatisticalTestAbstract::operator=(), vpStatisticalTestAbstract::setNbSamplesForStat(), vpStatisticalTestAbstract::updateStatistics(), and vpStatisticalTestAbstract::~vpStatisticalTestAbstract().

◆ m_stdev

float vpStatisticalTestAbstract::m_stdev
protectedinherited

Standard deviation of the monitored signal.

Definition at line 115 of file vpStatisticalTestAbstract.h.

Referenced by vpStatisticalTestHinkley::computeAlphaDelta(), computeDeltaAndLimits(), vpStatisticalTestMeanAdjustedCUSUM::computeDeltaAndLimits(), vpStatisticalTestSigma::computeLimits(), vpStatisticalTestShewhart::computeLimits(), vpStatisticalTestAbstract::init(), vpStatisticalTestShewhart::init(), init(), vpStatisticalTestHinkley::init(), vpStatisticalTestMeanAdjustedCUSUM::init(), vpStatisticalTestSigma::init(), vpStatisticalTestAbstract::operator=(), and vpStatisticalTestAbstract::updateStatistics().

◆ m_stdevmin

float vpStatisticalTestAbstract::m_stdevmin
protectedinherited

Minimum allowed standard deviation of the monitored signal.

Definition at line 116 of file vpStatisticalTestAbstract.h.

Referenced by vpStatisticalTestAbstract::updateStatistics().

◆ m_sumForMean

float vpStatisticalTestAbstract::m_sumForMean
protectedinherited

Sum of the samples used to compute the mean and standard deviation.

Definition at line 117 of file vpStatisticalTestAbstract.h.

Referenced by vpStatisticalTestAbstract::init(), vpStatisticalTestMeanAdjustedCUSUM::init(), vpStatisticalTestAbstract::operator=(), and vpStatisticalTestAbstract::updateStatistics().

◆ m_wt

float vpStatisticalTestEWMA::m_wt
protected

Test signal that permits to raise an alarm.

Definition at line 75 of file vpStatisticalTestEWMA.h.

Referenced by detectDownwardMeanDrift(), detectUpwardMeanDrift(), init(), updateStatistics(), and updateTestSignals().

◆ m_wtprev

float vpStatisticalTestEWMA::m_wtprev
protected

Previous value of the test signal.

Definition at line 76 of file vpStatisticalTestEWMA.h.

Referenced by init(), and updateTestSignals().