Fitting Very Flexible Models: Linear Regression With Large Numbers of Parameters
Fitting Very Flexible Models: Linear Regression With Large Numbers of Parameters
复制标题
拟合非常灵活的模型:具有大量参数的线性回归
DOI:
10.1088/1538-3873/ac20ac
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发表时间:
2021
影响因子:
3.5
通讯作者:
Villar, Soledad
中科院分区:
文献类型:
--
作者:
Hogg, David W.;Villar, Soledad
There are many uses for linear fitting; we consider here the interpolation and denoising of data, as when the goal is to fit a smooth, flexible function to a set of noisy data points. Investigators often choose a polynomial basis, or a Fourier basis, or wavelets, or something equally general. They also choose an order, or number of basis functions to fit, and (often) some kind of regularization. We discuss how this basis-function fitting is done, with ordinary least squares and extensions thereof. We emphasize that it can be valuable to choose far more parameters than data points, despite folk rules to the contrary: Suitably regularized models with enormous numbers of parameters generalize well and make good predictions for held-out data; over-fitting is not (mainly) a problem of having too many parameters. It is even possible to take the limit of infinite parameters, at which, if the basis and regularization are chosen correctly, the least-squares fit becomes the mean of a Gaussian process, or a kernel regression. We recommend cross-validation as a good empirical method for model selection (for example, setting the number of parameters and the form of the regularization), and jackknife resampling as a good empirical method for estimating the uncertainties of the predictions made by the model. We also give advice for building stable computational implementations.
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DOI:
10.1137/20m1359912
发表时间:
2020
期刊:
SIAM J. Math. Data Sci.
影响因子:
--
作者:
Weilin Li
通讯作者:
Weilin Li
DOI:
--
发表时间:
2012
期刊:
ArXiv
影响因子:
--
作者:
Alex Druinsky;Sivan Toledo
通讯作者:
Sivan Toledo
影响因子:
3
作者:
Epstein, CL
通讯作者:
Epstein, CL
DOI:
10.1073/pnas.1907378117
发表时间:
2020-12-01
影响因子:
11.1
作者:
Bartlett, Peter L.;Long, Philip M.;Tsigler, Alexander
通讯作者:
Tsigler, Alexander
DOI:
10.1073/pnas.1903070116
发表时间:
2019-08-06
影响因子:
11.1
作者:
Belkin, Mikhail;Hsu, Daniel;Mandal, Soumik
通讯作者:
Mandal, Soumik