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Unformatted text preview: ster also followed a random distribution. Here the parameter 'a' measures the mean number of clusters per unit area, and v the mean number of eggs per cluster. Clearly this distribution has a highly speed derivation and, to date, although geographical applications of the distribution have been suggested (see Harvey, 1966), the model has not provided adequate enough predictions for its assumptions to be considered as a suitable process explanation for these problems. One of the few examples of a probability distribution capable of describing uniformity in point patterns,with variance/mean ratios less than one has been developed by Dacey (1964). This model was derived to model the distribution of large towns (population greater than 2,500) in Iowa. In this example the cells of the census are Iowa's counties which were originally delimited, fortuitously it seems, as a square grid. Dacey assumed that two different processes should account for the frequency distribution of Iowa towns. Count...
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 Summer '08
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 Geography, The Land

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