By Charles Hall, Dr. John W. Day
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Additional info for Ecosystem Modeling in Theory and Practice: An Introduction With Case Histories
The net return per harvested individual is $10. Thus net income equals $10 × (total harvested). < previous page page_104 If you like this book, buy it! html9/3/2008 8:46:55 AM next page > page_105 < previous page page_105 next page > Page 105 individuals are harvested, so that the final and initial populations are equal in size. From Table 5 it is clear that policy 1, in which the maximum number is harvested each time, is not a desirable policy. Because the population is intensely harvested, the number of births is very small.
Naturally, such models would be built so as to take into account whatever limitations may exist on the builders' and/or users' ability to secure the data required to drive the model. Similarly, such models should also reflect the other limits that stem from the limited resources at the modeler's disposal: for example, his limited financial resources, time, computational capability, and so forth. " Finally, the characteristic that would confirm the Panglossian assumption that, indeed, we are discussing the best of all possible modeling situations, would be that our model states explicitly and provides us with data on our evaluative criteria.
Such functions may assume whatever form the model builder believes to be a satisfactory representation of the way in which the distinct aspects of value (the arguments of the function) ought to be combined. The exact function selected is always of crucial importance, for it does no less than to stipulate exactly how all the "incommensurable" aspects of a decision situation, including all the pertinent personal differences in outlook on the past of those involved are actually commensurate. Obviously, this is a tall order, and even when such a function is created to explicitly portray evaluation in the most limited of instances it will still be vulnerable to criticism.
Ecosystem Modeling in Theory and Practice: An Introduction With Case Histories by Charles Hall, Dr. John W. Day