如何根据y预测的给定数据建立方程？

Question

我有x-y数据如何从这些数据建立函数，以便在python中使用x值预测y？

X             Y
396.470001 => 0.012
401.480011 => 0.020
406.48999  => 0.026
411.5      => 0.032
416.51001  => 0.037
777.130005 => 0.357
782.140015 => 0.361
787.150024 => 0.363
792.159973 => 0.365
797.169983 => 0.366
817.200012 => 0.370
832.22998  => 0.373
897.340027 => 0.383
902.349976  =>0.384
907.359985  =>0.384
1092.680054 =>0.388
1097.689941 =>0.387
1102.699951 =>0.385
1283.01001  =>0.299
1293.030029 =>0.294
1298.040039 =>0.291
1303.040039 =>0.287
1308.050049 =>0.282
1313.060059 =>0.277
1318.069946 =>0.270
1323.079956 =>0.263
1328.089966 =>0.254
1333.099976 =>0.244
1338.099976 =>0.233
1343.109985 =>0.221
1348.119995 =>0.207
1443.290039 =>0.095
1628.609985 =>0.149
1633.619995 =>0.151
1638.619995 =>0.152
1643.630005 =>0.153
1648.640015 =>0.154
1653.650024 =>0.154
1658.660034 =>0.155
1663.670044 =>0.155
1668.680054 =>0.155
1673.689941 =>0.155
1678.689941 =>0.154
1683.699951 =>0.154
1688.709961 =>0.153
1693.719971 =>0.152
1698.72998  =>0.151
1703.73999  =>0.150
1708.75     =>0.148
1713.75     =>0.146
1718.76001  =>0.145
1723.77002  =>0.143
1728.780029 =>0.141
1733.790039 =>0.139
1738.800049 =>0.137
1743.810059 =>0.135
1748.819946 =>0.132
1753.819946 =>0.130
1758.829956 =>0.127
1763.839966 =>0.125
1768.849976 =>0.122
1959.180054 =>0.053
2500.120117 =>0.097

曲线如下所示：

我尝试了所有多项式学位，但它并不适合。

Answer 1

使用此在线网站获取X和Y之间的多项式方程。

http://www.xuru.org/rt/PR.asp