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• W2964247990 abstract "Misspecified models often provide useful information about the true data generating distribution. For example, if $y$ is a non–linear function of $x$ the least squares estimator $widehat{beta}$ is an estimate of $beta$, the slope of the best linear approximation to the non–linear function. Motivated by problems in astronomy, we study how to incorporate observation measurement error variances into fitting parameters of misspecified models. Our asymptotic theory focuses on the particular case of linear regression where often weighted least squares procedures are used to account for heteroskedasticity. We find that when the response is a non–linear function of the independent variable, the standard procedure of weighting by the inverse of the observation variances can be counter–productive. In particular, ordinary least squares may have lower asymptotic variance. We construct an adaptive estimator which has lower asymptotic variance than either OLS or standard WLS. We demonstrate our theory in a small simulation and apply these ideas to the problem of estimating the period of a periodic function using a sinusoidal model." @default.
• W2964247990 created "2019-07-30" @default.
• W2964247990 creator A5069261710 @default.
• W2964247990 date "2017-01-01" @default.
• W2964247990 modified "2023-09-25" @default.
• W2964247990 title "A note on parameter estimation for misspecified regression models with heteroskedastic errors" @default.
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• W2964247990 doi "https://doi.org/10.1214/17-ejs1255" @default.
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