1 | #ifndef STATS_H |
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2 | #define STATS_H |
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3 | |
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4 | #include <iostream> |
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5 | #include <math.h> |
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6 | #ifndef UTILS_H |
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7 | #include <Utils/utils.hh> |
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8 | #endif |
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9 | |
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10 | namespace Statistics |
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11 | { |
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12 | |
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13 | // Divide by the following correction factor to convert from |
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14 | // MADFM to sigma estimator. |
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15 | const float correctionFactor = 0.6744888; |
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16 | // Multiply by the following correction factor to convert from |
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17 | // trimmedSigma to sigma estimator. |
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18 | const double trimToNormal = 1.17036753077; |
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19 | |
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20 | template <class T> float madfmToSigma(T madfm){ |
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21 | return float(madfm)/correctionFactor; |
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22 | }; |
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23 | template float madfmToSigma<int>(int madfm); |
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24 | template float madfmToSigma<long>(long madfm); |
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25 | template float madfmToSigma<float>(float madfm); |
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26 | template float madfmToSigma<double>(double madfm); |
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27 | |
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28 | template <class Type> |
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29 | class StatsContainer |
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30 | { |
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31 | public: |
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32 | StatsContainer(){useRobust=true; defined=false; useFDR=false;}; |
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33 | virtual ~StatsContainer(){}; |
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34 | StatsContainer(const StatsContainer<Type>& s); |
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35 | StatsContainer<Type>& operator= (const StatsContainer<Type>& s); |
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36 | template <class T> friend std::ostream& operator<< ( std::ostream& theStream, StatsContainer<T> &s); |
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37 | |
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38 | float getMean(){return mean;}; |
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39 | void setMean(float f){mean=f;}; |
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40 | float getStddev(){return stddev;}; |
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41 | void setStddev(float f){stddev=f;}; |
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42 | Type getMedian(){return median;}; |
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43 | void setMedian(Type f){median=f;}; |
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44 | Type getMadfm(){return madfm;}; |
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45 | void setMadfm(Type f){madfm=f;}; |
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46 | float getThreshold(){return threshold;}; |
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47 | void setThreshold(float f){threshold=f;}; |
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48 | float getThresholdSNR(){ |
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49 | return (threshold - this->getMiddle())/this->getSpread();}; |
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50 | void setThresholdSNR(float snr){ |
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51 | threshold=this->getMiddle() + snr*this->getSpread();}; |
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52 | float getPThreshold(){return pThreshold;}; |
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53 | void setPThreshold(float f){pThreshold=f;}; |
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54 | bool getRobust(){return useRobust;}; |
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55 | void setRobust(bool b){useRobust=b;}; |
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56 | bool setUseFDR(){return useFDR;}; |
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57 | void setUseFDR(bool b){useFDR=b;}; |
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58 | |
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59 | float getMiddle(){if(useRobust) return float(median); else return mean;}; |
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60 | float getSpread(){ |
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61 | if(useRobust) return madfmToSigma(madfm); |
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62 | else return stddev; |
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63 | }; |
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64 | |
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65 | float getPValue(float value){ |
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66 | float zStat = (value - this->getMiddle()) / this->getSpread(); |
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67 | return 0.5 * erfc( zStat / M_SQRT2 ); |
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68 | }; |
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69 | |
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70 | bool isDetection(float value){ |
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71 | if(useFDR) return (this->getPValue(value) < this->pThreshold); |
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72 | else return (value > this->threshold); |
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73 | }; |
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74 | |
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75 | // Functions to calculate the stats for a given array. |
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76 | // The idea here is that there are two options to do the calculations: |
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77 | // *The first just uses all the points in the array. If you need to |
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78 | // remove BLANK points (or something similar), do this beforehand. |
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79 | // *Alternatively, construct a bool array of the same size, showing which |
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80 | // points are good, and use the second option. |
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81 | void calculate(Type *array, long size); |
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82 | void calculate(Type *array, long size, bool *isGood); |
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83 | |
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84 | private: |
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85 | bool defined; // a flag indicating whether the stats are defined. |
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86 | |
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87 | // basic statistics |
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88 | float mean; |
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89 | float stddev; |
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90 | Type median; |
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91 | Type madfm; |
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92 | |
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93 | float threshold; // a threshold for simple sigma-clipping |
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94 | float pThreshold; // a threshold for the FDR case -- the upper limit |
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95 | // of P values that detected pixels can have. |
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96 | bool useRobust; // whether we use the two robust stats or not |
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97 | bool useFDR; // whether the FDR method is used for determining a |
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98 | // detection |
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99 | |
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100 | }; |
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101 | |
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102 | } |
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103 | |
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104 | #endif /*STATS_H*/ |
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