| OpenMS 2.5.0

Public Member Functions | Static Public Member Functions | List of all members
SteinScottImproveScore Class Reference
Spectrum Comparison

Similarity score based of Stein & Scott. More...

`#include <OpenMS/COMPARISON/SPECTRA/SteinScottImproveScore.h>`

Inheritance diagram for SteinScottImproveScore:

## Public Member Functions

| SteinScottImproveScore ()
| default constructor More...
| SteinScottImproveScore (const SteinScottImproveScore &source)
| copy constructor More...
| ~SteinScottImproveScore () override
| destructor More...
SteinScottImproveScore & | operator= (const SteinScottImproveScore &source)
| assignment operator More...
double | operator() (const PeakSpectrum &spec1, const PeakSpectrum &spec2) const override
| Similarity pairwise score. More...
double | operator() (const PeakSpectrum &spec) const override
| Similarity pairwise score itself. More...
Public Member Functions inherited from PeakSpectrumCompareFunctor
| PeakSpectrumCompareFunctor ()
| default constructor More...
| PeakSpectrumCompareFunctor (const PeakSpectrumCompareFunctor &source)
| copy constructor More...
| ~PeakSpectrumCompareFunctor () override
| destructor More...
PeakSpectrumCompareFunctor & | operator= (const PeakSpectrumCompareFunctor &source)
| assignment operator More...
Public Member Functions inherited from DefaultParamHandler
| DefaultParamHandler (const String &name)
| Constructor with name that is displayed in error messages. More...
| DefaultParamHandler (const DefaultParamHandler &rhs)
| Copy constructor. More...
virtual | ~DefaultParamHandler ()
| Destructor. More...
virtual DefaultParamHandler & | operator= (const DefaultParamHandler &rhs)
| Assignment operator. More...
virtual bool | operator== (const DefaultParamHandler &rhs) const
| Equality operator. More...
void | setParameters (const Param &param)
| Sets the parameters. More...
const Param & | getParameters () const
| Non-mutable access to the parameters. More...
const Param & | getDefaults () const
| Non-mutable access to the default parameters. More...
const String & | getName () const
| Non-mutable access to the name. More...
void | setName (const String &name)
| Mutable access to the name. More...
const std::vector< String > & | getSubsections () const
| Non-mutable access to the registered subsections. More...

## Static Public Member Functions

static PeakSpectrumCompareFunctor * | create ()
static const String | getProductName ()
Static Public Member Functions inherited from PeakSpectrumCompareFunctor
static void | registerChildren ()
| registers all derived products More...
static const String | getProductName ()

## Additional Inherited Members

Protected Member Functions inherited from DefaultParamHandler
virtual void | updateMembers_ ()
| This method is used to update extra member variables at the end of the setParameters() method. More...
void | defaultsToParam_ ()
| Updates the parameters after the defaults have been set in the constructor. More...
Protected Attributes inherited from DefaultParamHandler
Param | param_
| Container for current parameters. More...
Param | defaults_
| Container for default parameters. This member should be filled in the constructor of derived classes! More...
std::vector< String > | subsections_
| Container for registered subsections. This member should be filled in the constructor of derived classes! More...
String | error_name_
| Name that is displayed in error messages during the parameter checking. More...
bool | check_defaults_
| If this member is set to false no checking if parameters in done;. More...
bool | warn_empty_defaults_
| If this member is set to false no warning is emitted when defaults are empty;. More...

## Detailed Description

Similarity score based of Stein & Scott.

This is a pairwise based score function. The spectrum contains peaks, and each peak can be defined by two values (mz and the intensity). The score function takes the sum of the product of the peak intensities from Spectrum 1 and Spectrum 2, only if the mz-ratio distance between the two spectra is smaller than a given window size. In the default status, the window size is (accuracy of the mass spectrometer). This sum is normalised by dividing it with a distance function. sqrt(sum of the Intensity of square Spectrum1 sum of the Intensity of square Spectrum2). This is all based on SteinScott score. To distinguish the close from the distant spectra an additional term is calculated. It denotes the expected value of both Spectra under the random placement of all peaks, within the given mass-to-charge range. The probability that two peaks with randomized intensity values lie within two epsilon of each other is a constant. This constant is proportional to epsilon. So the additional term is the sum over all peaks of Spectrum 1 and Spectrum 2 of the products of their intensities multiplied with the constant.

The details of the score can be found in: Signal Maps for Mass Spectrometry-based Comparative Proteomics Amol Prakash, Parag Mallick , Jeffrey Whiteaker, Heidi Zhang, Amanda Paulovich, Mark Flory, Hookeun Lee, Ruedi Aebersold, and Benno Schwikowski

Parameters of this class are:

Name | Type | Default | Restrictions | Description
--- | --- | --- | --- | ---
tolerance | float | 0.2 |  | defines the absolute error of the mass spectrometer
threshold | float | 0.2 |  | if the calculated score is smaller than the threshold, a zero is given back

Note:

- If a section name is documented, the documentation is displayed as tooltip.
- Advanced parameter names are italic.

## Constructor & Destructor Documentation

## ◆ SteinScottImproveScore() [1/2]

SteinScottImproveScore | ( |  | ) |

default constructor

## ◆ SteinScottImproveScore() [2/2]

SteinScottImproveScore | ( | const SteinScottImproveScore & | source | ) |

copy constructor

## ◆ ~SteinScottImproveScore()

~SteinScottImproveScore | ( |  | ) |

override

destructor

## Member Function Documentation

## ◆ create()

static PeakSpectrumCompareFunctor* create | ( |  | ) |

inline static

## ◆ getProductName()

static const String getProductName | ( |  | ) |

inline static

## ◆ operator()() [1/2]

double operator() | ( | const PeakSpectrum & | spec1,
|  | const PeakSpectrum & | spec2
| ) |  | const

override virtual

Similarity pairwise score.

This function return the similarity score of two Spectra based on SteinScott.

Implements PeakSpectrumCompareFunctor.

## ◆ operator()() [2/2]

double operator() | ( | const PeakSpectrum & | spec | ) | const

override virtual

Similarity pairwise score itself.

This function return the similarity score of itself based on SteinScott.

Implements PeakSpectrumCompareFunctor.

## ◆ operator=()

SteinScottImproveScore& operator= | ( | const SteinScottImproveScore & | source | ) |

assignment operator