MATLAB 竞价与曝光次数关系分析：四次非线性拟合及异常值处理

%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%88%E9%81%A0%E6%96%87%E5%BC%8F%E5%80%BC%E7%9A%84%E9%97%A8%E5%80%BC%EF%BC%88%E4%BE%8B%E5%A6%82%EF%BC%8C%E8%B6%85%E8%BF%873%E5%80%AB%E6%A0%87%E5%87%86%E5%B7%AE%E5%8C%85%EF%BC%89%0Athreshold%20%3D%203%20*%20std(impression);%0A%0A%25%20%E6%89%BE%E5%88%B0%E6%89%80%E6%9C%89%E5%90%AB%E5%B8%B8%E5%80%BC%E7%9A%84%E8%A1%8C%E7%B4%A2%E5%BC%95%0Aoutlier_rows%20%3D%20any(abs(impression%20-%20mean(impression))%20%3E%20threshold,%202);%0A%0A%25%20%E5%88%A0%E9%99%A4%E5%90%AB%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%AF%94%E5%90%88%E5%87%BD%E6%95%B0%0Af%20%3D%20fit(bid_cleaned,%20impression_cleaned,%20'poly4');%20%25%20%E4%BD%BF%E7%94%A8%E5%9B%9B%E6%AC%A1%E5%A4%9A%E9%A1%B9%E5%BC%8F%E8%BF%9B%E8%A1%8C%E6%AF%94%E5%90%88%0A%0A%25%20%E6%95%B0%E6%8D%AE%E5%8F%AF%E8%A7%A8%E5%8C%96%EF%BC%88%E5%88%A0%E9%99%A4%E5%B8%B8%E5%80%BC%E5%90%8E%EF%BC%89%0Ascatter(bid_cleaned,%20impression_cleaned);%0Ahold%20on;%0Aplot(f,%20'r');%0Axlabel('竞价');%0Aylabel('曝光次数');%0Atitle('竞价与曝光次数关系（删除异常值后）');%0Alegend('数据点',%20'拟合线');%0Ahold%20off;