Line transect estimators for left-truncated distributions.

J R Alldredge; C E Gates

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PubMed · 4005381

Line transect estimators for left-truncated distributions.

J R Alldredge·C E Gates

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Abstract

Left-truncated line transect data sets may occur when surveying with certain types of aircraft where the observer cannot look straight down. A general model of left-truncation in line transect sampling is developed and parametric estimators are derived in such cases when the underlying distribution of right-angle distances is either exponentially or half-normally distributed. Computer simulations demonstrate the validity of the derived estimators and the expected nonrobustness against alternative distributions. An aerial survey example using dolphin data is presented.

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Animals Biometry Humans Models, Biological Population Density Probability Vision, Ocular Journal Article Research Support, U.S. Gov't, Non-P.H.S.

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J R Alldredge, C E Gates. 1985. Line transect estimators for left-truncated distributions.. https://pubmed.ncbi.nlm.nih.gov/4005381/

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