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A Graphical Aid for Analyzing Autocorrelated Dynamical Systems 465 be readily identified as uniÄ…ue depositional environments. Since only one area has been examined in this manner, it is not known at this time if an offshore bar in one part of the world would have the same signature as an offshore bar in another part of the world.

Example of Assistance with Model Building

In this case (Russell, 1993), there was a desire to fit a model to the monthly number of families on food stamps in Texas. An cursory examination of the data set showed an explosive growth in the number of households on food stamps over the past decade. The standard time-plot of the number of households on food stamps is presented in FigurÄ™ 28 below. Of interest is: how do we manage to fit a model to this data to make reasonable budgetary predictions for the next 5 years?

Households on Food Stamps

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1    12 23 34 45 56 67 78 89 100 111 122 133

DatÄ™

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FigurÄ™ 28. Monthly number of households on food stamps in Texas. The data covers the period from September 1981 through November 1992.