C++ ビッグ データ開発におけるデータのノイズ除去の問題にどう対処するか?

#include <iostream>
#include <vector>
#include <algorithm>

double detectOutlier(std::vector<double> data) {
    std::sort(data.begin(), data.end());
    
    double q1 = data[data.size() / 4];
    double q3 = data[data.size() / 4 * 3];
    double iqr = q3 - q1;
    
    double upperBound = q3 + 1.5 * iqr;
    double lowerBound = q1 - 1.5 * iqr;
    
    for (auto d : data) {
        if (d > upperBound || d < lowerBound) {
            return d;
        }
    }
    
    return -1;
}

int main() {
    std::vector<double> data = {1.2, 2.1, 3.5, 4.0, 5.1, 6.2, 7.3, 100.0};
    
    double outlier = detectOutlier(data);
    
    if (outlier != -1) {
        std::cout << "Detected outlier: " << outlier << std::endl;
    } else {
        std::cout << "No outlier detected." << std::endl;
    }
    
    return 0;
}

#include <iostream>
#include <vector>

std::vector<double> smoothFilter(std::vector<double> data, int windowSize) {
    std::vector<double> result(data.size(), 0.0);
    
    int halfWindow = windowSize / 2;
    
    for (int i = halfWindow; i < data.size() - halfWindow; i++) {
        double sum = 0.0;
        
        for (int j = i - halfWindow; j <= i + halfWindow; j++) {
            sum += data[j];
        }
        
        result[i] = sum / windowSize;
    }
    
    return result;
}

int main() {
    std::vector<double> data = {1.0, 2.0, 4.0, 3.0, 5.0};
    int windowSize = 3;
    
    std::vector<double> result = smoothFilter(data, windowSize);
    
    std::cout << "Original data: ";
    for (auto d : data) {
        std::cout << d << " ";
    }
    std::cout << std::endl;
    
    std::cout << "Smoothed data: ";
    for (auto r : result) {
        std::cout << r << " ";
    }
    std::cout << std::endl;
    
    return 0;
}