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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Decide what level of precision you require. Do you want your estimate of the
mean to be accurate within +10% of the true population mean? Within +1% of the
true mean? You must decide what the desired error limits will be for your sample.
This empirical relationship can be used to estimate the number of samples you
need to take to achieve a specified level of precision: h = 0.754m-9378w-0267p–
2 (7.32) where fi = Estimated sample size needed for zooplankton sampling m ...
(9.34) where 2 Y = Total accumulated count in n quadrats a1, a2 = Slope
parameters of quadratic equation (9.32) D = Desired level of precision as defined
in equation (9.33) Equation (9.34) has been called the “stop line” by Kuno (1969),