Abstract
We study a class of semiparametric skewed distributions arising when the sample selection process produces non-randomly sampled observations. Based on semiparametric theory and taking into account the symmetric nature of the population distribution, we propose both consistent estimators, i.e. robust to model mis-specification, and efficient estimators, i.e. reaching the minimum possible estimation variance, of the location of the symmetric population. We demonstrate the theoretical properties of our estimators through asymptotic analysis and assess their finite sample performance through simulations. We also implement our methodology on a real data example of ambulatory expenditures to illustrate the applicability of the estimators in practice.
Original language | English (US) |
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Pages (from-to) | 1-11 |
Number of pages | 11 |
Journal | Stat |
Volume | 1 |
Issue number | 1 |
DOIs | |
State | Published - Oct 2012 |
Bibliographical note
Publisher Copyright:© 2012 John Wiley & Sons, Ltd.
Keywords
- Robustness
- Selection bias
- Semiparametric model
- Skew-symmetric distribution
- Skewness
ASJC Scopus subject areas
- Statistics and Probability
- Statistics, Probability and Uncertainty