Rahel Sollmann
North Carolina State University,
Department of Forestry and Environmental Resources
Raleigh, NC, USA
E-mail: [email protected]

Beth Gardner
North Carolina State University
Department of Forestry and Environmental Resources
Raleigh, NC, USA

Richard B. Chandler
University of Georgia
Warnell School of Forestry and Natural Resources
Athens, GA, USA

J. Andrew Royle
USGS Patuxent Wildlife Research Center
Laurel, MD, USA

T. Scott Sillett
Smithsonian Conservation Biology Institute
Migratory Bird Center
Washington, DC, USA

Detection_function_JAGS.txt  (MD5: 007162c2064a70a7f698ac0d890409b4): Code snippets showing alternative implementations of the half-normal detection function.

HNsimresults.csv  (MD5: 80167ae96557e20304ebe21f686e9b2f): Tables with summary results of simulation study to investigate bias and confidence interval coverage of two implementations of the half-normal detection function.

We present an alternative, less coarse, yet more time consuming approximation of the integral in Eq. 1 in the text, as well as the closed-form implementation of that integral for line transect sampling, as well as an assessment of the bias and confidence interval coverage of the two approximations for point surveys.