Supplement 2. Evaluation of the approximation of the detection function and alternative implementations.

File List 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. Description 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.