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Abstract
We develop estimators for line transect surveys of animals that are stochastically unavailable for detection while within detection range. The detection process is formulated as a hidden Markov model with a binary state-dependent observation model that depends on both perpendicular and forward distances. This provides a parametric method of dealing with availability bias when estimates of availability process parameters are available even if series of availability events themselves are not. We apply the estimators to an aerial and a shipboard survey of whales, and investigate their properties by simulation. They are shown to be more general and more flexible than existing estimators based on parametric models of the availability process. We also find that methods using availability correction factors can be very biased when surveys are not close to being instantaneous, as can estimators that assume temporal independence in availability when there is temporal dependence.
Original language | English |
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Pages (from-to) | 703-713 |
Number of pages | 11 |
Journal | Biometrics |
Volume | 69 |
Issue number | 3 |
Early online date | 12 Jul 2013 |
DOIs | |
Publication status | Published - 2013 |
Keywords
- Availability bias
- Detection hazard
- Hidden Markov model
- Line transect
- Wildlife survey
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Dive into the research topics of 'Using hidden Markov models to deal with availability bias on line transect surveys'. Together they form a unique fingerprint.Projects
- 1 Finished
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National Centre for Statistical Ecology: National Centre for Statistical Ecology
Buckland, S. T. (PI)
1/10/10 → 30/09/15
Project: Standard