Black bear

Conduct Downing population reconstruction on harvest data:

From an input Excel file of year, total harvest, and harvest-at-age, the program performs the calculations for a Downing population reconstruction, estimating minimum abundance by age and total minimum abundance for the population. The program allows the user to decide whether older age classes are collapsed into a single age class. A regression of the log-transformed abundance estimates provides estimates of R (% annual growth) and r (instantaneous rate of change), as well as significance of the slope of the regression. The program also provides the option for creating graphs of these data. The updated (2011) version also allows for the incorporation of natural mortality into reconstructed estimates.

Download the NEW setup program here:

Man pointing to a trend line

Characterize trends in abundance:

Reads in an Excel file with year and survey index values, then log-transforms these data and performs a linear regression. An easy way to calculate p-values, r-squared, and significance of a trend. Also calculates population dynamics parameters R (% annual growth) and r (instantaneous rate of change). Displays observed data and regression trendline in a graph.

Programmed by: Chris Hayes, Valquiria Quirino, Pamela Swint, Andrew Trent, and Hao Yu

Download the setup program here:


Bat flying

Convert ANABAT data to activity indices:

Reads in the text-file output of standard ANABAT screens, then converts these data to presence/absence by species for each minute observed. Provides the option to further summarize these data into species presence/absence for 15-minute, 1-hour, or nightly time periods.

Programmed by: Paige Barlow, Dan Catlin, Bonnie Coggins, and Brett Ostby

Download the setup program here:


Coordinate points

Calculate pairwise distances among points:

From an input file of X and Y coordinates (with ID numbers), the program calculates distance between all pairs of points. Calculates summary statistics, including number of points, minimum and maximum distance between pairs, and the mean and standard deviation of distance among all pairs. Additionally, the program identifies the closest point to each point and the distance to the closest point. Very useful for telemetry research and GIS applications.

Programmed by: Nick LaPointe, Om Poudel, Catherine Tredick, and Daniel Waiswa

Download the setup program here:





Question mark on keyboard

How to install these programs:

  1. Save the *.zip file to your computer (probably your desktop) and unzip it. You can download WinZip free here.
  2. Double-click the setup.exe file to start installing the program, and follow the directions.
  3. Depending on the software you have on your computer, installation might require downloading additional update files (this should happen automatically during installation).
  4. The program will be installed in your Programs folder. You can access it through Start...All Programs...Virginia Tech.
  5. All programs include sample input files and text files with directions for use.
  6. To uninstall a program, just go to Add/Remove Programs in your computer's Control Panel.