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Activity Number:
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466
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Type:
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Contributed
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Date/Time:
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Wednesday, August 9, 2006 : 2:00 PM to 3:50 PM
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Sponsor:
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Section on Statistics and the Environment
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| Abstract - #307459 |
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Title:
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A Case Study in Estimating Percentage Detection Biases along a Recorded Ozone Profile
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Author(s):
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Wendy Meiring*+
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Companies:
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University of California, Santa Barbara
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Address:
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Statistics and Applied Probability, Santa Barbara, CA, 93106-3110,
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Keywords:
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environmental ; ozone ; functional ; instrument bias
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Abstract:
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We consider biases in recorded ozone partial pressures measured as functions of altitude by balloon-based instruments. Biases exist due to percentage detection errors that vary with altitude, due in part to changing instrument pump-efficiencies. Our goal is to estimate the altitude-dependent percentage detection biases. We study a sequence of ozone profile measurements over one geographical location, with each measurement profile being the entire recorded altitude-dependent ozone profile at a particular time. By incorporating other sources of ozone measurements on an integrated spatial scale, we frame estimation of the percentage detection profile as estimation in a functional linear model with a scalar response and functional explanatory variable. Simulations demonstrate improved estimation stability by incorporating physically motivated constraints on the percentage detection function.
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