Benjamin/Cummings, 1999 - Science - 620 pages
This coherent text translates the methods of statisticians into "ecological English" so that students may readily apply these methods to the real world. Ecological Methodology, Second Edition provides a balance of material on animal and plant populations. It teaches students of ecology how to design the most efficient tests in order to obtain maximum precision with minimal work. The first part of the text focuses on biological and technical issues in statistical methodology. Students learn about advances that have been made in designing better sampling devices, along with the techniques and equipment used for sampling. The second part deals with creating solid statistical design, and presents all methods that are well-known to statisticians in a language and context that students will easily understand.
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But in the third sample marked animals may have been last caught at time 2 (15)
or time 1 (1). ... Given a Method B table, we can now define the following
variables using the terminology of Jolly (1965): , = Number of marked animals
caught in ...
If the ratio Xls, where s is the total number of sampling times, is less than about
0.25, a Poisson distribution can be fitted as an approximation ... Given m, we can
obtain the expected frequency distribution: Expected number of animals U _e "m"
Perception bias results from observers missing animals that are in view. A
number of computer simulation programs are now available to illustrate counting
bias in the classroom or in training sessions. WILDLIFE COUNTS* is one