Evidence of absence (v2.0) software user guide

Data Series 1055
Prepared in cooperation with the U.S. Fish and Wildlife Service
By: , and 



Evidence of Absence software (EoA) is a user-friendly software application for estimating bird and bat fatalities at wind farms and for designing search protocols. The software is particularly useful in addressing whether the number of fatalities is below a given threshold and what search parameters are needed to give assurance that thresholds were not exceeded. The software also includes tools (1) for estimating carcass persistence distributions and searcher efficiency parameters (𝑝 and 𝑘) from field trials, (2) for projecting future mortality based on past monitoring data, and (3) for exploring the potential consequences of various choices in the design of long-term incidental take permits for protected species. The software was designed specifically for cases where tolerance for mortality is low and carcass counts are small or even 0, but the tools also may be used for mortality estimates when carcass counts are large.

Suggested Citation

Dalthorp, Daniel, Huso, Manuela, and Dail, David, 2017, Evidence of absence (v2.0) software user guide: U.S. Geological Survey Data Series 1055, 109 p., https://doi.org/10.3133/ds1055.

ISSN: 2327-638X (online)

Table of Contents

  • Abstract
  • Introduction
  • Single Class Module
  • Multiple Class Module
  • Multiple Years Module
  • Design Tradeoffs
  • Scenario Explorer
  • Acknowledgments
  • References Cited
  • Appendixes A–K
Publication type Report
Publication Subtype USGS Numbered Series
Title Evidence of absence (v2.0) software user guide
Series title Data Series
Series number 1055
DOI 10.3133/ds1055
Year Published 2017
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) Forest and Rangeland Ecosystem Science Center
Description Report: viii, 109 p.; Additional Report Pieces
Online Only (Y/N) Y
Google Analytic Metrics Metrics page
Additional publication details