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Abstract Details
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Activity Number:
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387
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Type:
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Invited
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Date/Time:
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Tuesday, August 2, 2011 : 2:00 PM to 3:50 PM
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Sponsor:
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Section on Physical and Engineering Sciences
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| Abstract - #300345 |
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Title:
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Facing Heteroscedastic Measurement Error in Astronomical Surveys
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Author(s):
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Chad Schafer*+
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Companies:
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Carnegie Mellon University
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Address:
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5000 Forbes Avenue, Pittsburgh, PA, 15213, United States
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Keywords:
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astronomy ;
measurement error ;
density estimation ;
nonparametrics ;
truncation ;
likelihood-free inference
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Abstract:
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Current and forthcoming sky surveys force astronomers to face a difficult challenge: The estimation of the redshifts (a key proxy for distance in space-time) of astronomical objects using only limited, noisy observations of these objects. The resulting heteroscedastic measurement error strongly affects downstream inference procedures that require these quantities. We will focus on the implications for nonparametric density estimation in astronomical problems; this is an application that already posed difficulties due to irregular truncation of the space of observables. We will discuss the potential of likelihood-free methods for handling such challenges.
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Authors who are presenting talks have a * after their name.
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