Hazard Models for Line Transect Surveys with Independent Observers
Article first published online: 26 MAY 2004
Volume 55, Issue 1, pages 29–36, March 1999
How to Cite
Skaug, H. J. and Schweder, T. (1999), Hazard Models for Line Transect Surveys with Independent Observers. Biometrics, 55: 29–36. doi: 10.1111/j.0006-341X.1999.00029.x
- Issue published online: 26 MAY 2004
- Article first published online: 26 MAY 2004
- Received March 1997. Revised April 1998. Accepted May 1998.
- Hazard models;
- Independent observers;
- Line transect surveys
Summary. The likelihood function for data from independent observer line transect surveys is derived, and a hazard model is proposed for the situation where animals are available for detection only at discrete time points. Under the assumption that the time points of availability follow a Poisson point process, we obtain an analytical expression for the detection function. We discuss different criteria for choosing the hazard function and consider in particular two different parametric families of hazard functions. Discrete and continuous hazard models are compared and the robustness of the discrete model is investigated. Finally, the methodology is applied to data from a survey for minke whales in the northeastern Atlantic.