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Show a. " Regrowing" the population projections by building upon the components of the population, either by the population cohort technique plus labor force and in- migration analysis ( as in the UPED model); or by more gross approximations of the replication technique. The approximation approach is used to cross- check the more detailed technique. The essence of this approach-- " regrowing" the population-- is to build it up over time intervals " from the inside out." b. Prorating downward from projections of population and labor force size for larger area units ( e. g., the United States or the State); in essence this technique is to replicate " from the outside in." This section describes a proration check on the projections of the Salt Lake County population, as has been developed in Series C- DF of the UPED model, by the experts of the BEBR of the university of Utah. The assumptions, techniques, and components of the UPED modeling program have been well described elsewhere. L) The major premises and techniques are considered eminently sound. Table 3 shows the total population projections for Salt Lake County, and for the Wasatch Front, 1975- 1995 by five year intervals, as developed in the Series C- DF analysis ( see columns 3 and 4). Population projections for the five Wasatch Front counties ( Salt Lake, Davis, Morgan, Weber, and Toole), as developed in Alternative Zero in the analysis by the State Office of the Planning Coordinator, are shown in column 6 of Table 3. The latter series was developed through the year 1990 in the State's UPED analysis, and the figure for 1995 was prepared in the Williams and Mocine survey. Comparing the Salt Lake County figures with those for the total Wasatch Front Series C projection, we observe that between now and 1995 the County's population slowly but steadily declines as a percent of the total ( see column 5). This continues the trend already observable between 1960 and 1970. 9 |