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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Method 3: Sampling with Probability Proportional to Size Method 3 can be used
on equal-size sampling units or unequal-size units. Each stratum is divided into
sampling units of any size or shape—transects, quadrats, or blocks. Instead of ...
where N, = Size of stratum h (number of possible sample units in stratum h) N =
Size of entire statistical population The stratum weights are proportions and must
add up to 1.0 (Table 8.3). Note that the No. must be expressed in sample units.
If the sampling units are of varying size, calculations of the estimated means and
variances are more complex. The specific details are too complex to be
condensed simply in this book (see Cochran 1977, Chapter 11). There are two