MATLAB 支持向量回归：分析竞价与曝光次数关系并优化拟合

%20%E5%AF%BC%E5%85%A5%E6%95%B0%E6%8D%AE%0Adata%20%3D%20xlsread('Impression%26%26CPC.xlsx',%20'Sheet1');%0Abid%20%3D%20data(:,%202);%20%25%20%E7%AB%9E%E4%BB%A3%0Aimpression%20%3D%20data(:,%201);%20%25%20%E6%9B%9D%E5%85%A5%E6%AC%A1%E6%95%B0%0A%0A%25%20%E8%AE%A1%E7%AE%97%E6%9B%9D%E5%85%A5%E6%AC%A1%E6%95%B0%E7%9A%84%E4%B8%8A%E4%B8%8B%E5%9B%9B%E5%88%86%E4%BD%8D%E6%95%B0%E5%92%8CIQR%0AQ1%20%3D%20prctile(impression,%2025);%0AQ3%20%3D%20prctile(impression,%2075);%0AIQR%20%3D%20Q3%20-%20Q1;%0A%0A%25%20%E5%AE%9A%E4%B9%89%E5%BC%82%E5%B8%B8%E5%80%BC%E7%9A%84%E9%99%A5%E5%80%BC%EF%BC%88%E4%BD%95%E5%A4%9A%EF%BC%8C%E8%B6%85%E8%BF%872%E5%80%ABIQR%EF%BC%89%0Athreshold%20%3D%202%20*%20IQR;%0A%0A%25%20%E6%89%BE%E5%88%B0%E6%89%80%E6%9C%89%E5%90%AB%E5%BC%82%E5%B8%B8%E5%80%BC%E7%9A%84%E8%A1%8C%E7%B4%A2%E5%BC%95%0Aoutlier_rows%20%3D%20impression%20%3C%20(Q1%20-%20threshold)%20%7C%20impression%20%3E%20(Q3%20+%20threshold);%0A%0A%25%20%E5%88%A0%E9%99%A4%E5%90%AB%E5%BC%82%E5%B8%B8%E5%80%BC%E7%9A%84%E8%A1%8C%0Abid_cleaned%20%3D%20bid(~outlier_rows);%0Aimpression_cleaned%20%3D%20impression(~outlier_rows);%0A%0A%25%20%E6%94%AF%E6%8C%81%E7%90%86%E9%87%8F%E5%9B%9E%E5%9B%9E%E5%87%BA%E5%90%88%0Aepsilon%20%3D%200.1;%20%25%20%CE%B5%E5%8F%82%E6%95%B0%EF%BC%8C%E6%8E%A7%E5%88%B6%E5%87%BA%E5%90%88%E7%9A%84%E5%AE%B9%E8%A7%81%E5%BA%A6%0AC%20%3D%201.0;%20%25%20%E7%BD%9A%E7%A6%BB%E5%8F%82%E6%95%B0%EF%BC%8C%E6%8E%A7%E5%88%B6%E5%87%BA%E5%90%88%E7%9A%84%E5%B9%B3%E6%BB%91%E5%BA%A6%0Amodel%20%3D%20fitrsvm(bid_cleaned,%20impression_cleaned,%20'KernelFunction',%20'gaussian',%20'Epsilon',%20epsilon,%20'BoxConstraint',%20C);%0A%0A%25%20%E9%A8%8E%E6%B8%AC%E5%87%BA%E5%90%88%E5%80%BC%0Ay_fit%20%3D%20predict(model,%20bid_cleaned);%0A%0A%25%20%E6%95%B0%E6%8D%AE%E5%8F%AF%E8%A7%86%E5%8C%96%EF%BC%88%E5%88%A0%E9%99%A4%E5%BC%82%E5%B8%B8%E5%80%BC%E5%90%8E%EF%BC%89%0Ascatter(bid_cleaned,%20impression_cleaned);%0Ahold%20on;%0Aplot(bid_cleaned,%20y_fit,%20'r');%0Axlabel('竞价');%0Aylabel('曝光次数');%0Atitle('竞价与曝光次数关系（支持向量回归拟合）');%0Alegend('数据点',%20'拟合线');%0Ahold%20off;%0A%0A%25%20%E8%AE%A1%E7%AE%97%E5%87%BA%E5%90%88%E6%9B%B2%E7%BA%BF%E4%B8%8E%E5%AE%9E%E9%99%85%E6%95%B0%E6%8D%AE%E4%B9%8B%E9%97%B4%E7%9A%84%E7%9B%B8%E5%85%B3%E7%B3%BB%E6%95%B0%0Acorrelation%20%3D%20corrcoef(impression_cleaned,%20y_fit);%0Ar%20%3D%20correlation(1,%202);%0A%0A%25%20%E8%BE%93%E5%87%BA%E7%9B%B8%E5%85%B3%E7%B3%BB%E6%95%B0%0Adisp(['相关系数：',%20num2str(r)]);%0A%0A%25%20%E5%A2%9E%E5%A4%A7%E7%9B%B8%E5%85%B3%E7%B3%BB%E6%95%B0%E5%88%B00.9%0Awhile%20r%20%3C%200.9%0A%20%20%20%20epsilon%20%3D%20epsilon%20*%202;%20%25%20%E8%BF%87%E6%95%B4%20%CE%B5%20%E5%8F%82%E6%95%B0%0A%20%20%20%20model%20%3D%20fitrsvm(bid_cleaned,%20impression_cleaned,%20'KernelFunction',%20'gaussian',%20'Epsilon',%20epsilon,%20'BoxConstraint',%20C);%0A%20%20%20%20y_fit%20%3D%20predict(model,%20bid_cleaned);%0A%20%20%20%20correlation%20%3D%20corrcoef(impression_cleaned,%20y_fit);%0A%20%20%20%20r%20%3D%20correlation(1,%202);%0Aend%0A%0A%25%20%E9%87%8D%E6%96%B0%E7%BB%98%E7%94%BB%E5%87%BA%E5%90%88%E6%9B%B2%E7%BA%BF%0Afigure;%0Ascatter(bid_cleaned,%20impression_cleaned);%0Ahold%20on;%0Aplot(bid_cleaned,%20y_fit,%20'r');%0Axlabel('竞价');%0Aylabel('曝光次数');%0Atitle('竞价与曝光次数关系（支持向量回归拟合）');%0Alegend('数据点',%20'拟合线');%0Ahold%20off;%0A%0A%25%20%E8%BE%93%E5%87%BA%E8%BF%87%E6%95%B4%E5%90%8E%E7%9A%84%E7%9B%B8%E5%85%B3%E7%B3%BB%E6%95%B0%0Adisp(['调整后的相关系数：',%20num2str(r)]);