Quadrat Analysis_RW_Thomas

Having defined the study area we then construct the

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Unformatted text preview: en construct the frequency array. This is achieved by adopting the procedure of either quadrat censusing, or quadrat samolinq. We have already described quadrat censusing which involved deciding on a cell size and then laying a contiguous grid of these cells over the study area. Fig.2(ii) illustrates the results of censusing the hypothetical pattern with two different cell sizes. The problem of selecting an appropriate cell size is quite complex and is treated separately in sections V (ii) and VI (iii). Quadrat sampling depends on selecting a single cell of a predetermined size and then randomly placing the cell over the study area n times. With quadrat sampling the frequency distribution is obtained by counting the number of points lying within the quadrat on each of the n random placings and then points located within the study area, while quadrat sampling yields an estimate of the frequency distribution obtained from a random spatial sample. In the case of quadrat censusing the average density of points depends on n and Fig. 1 : Some example patterns 4 5 Usuall...
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