in the simple case shown in Figure 4.21 (Spooner, 1975, p. 35). Note that equation (4.16) is simply a historical reconstruction of the relationships between two series, i.e. national unemployment, the input wave (x), and local unemployment. the output wave (y). Since inforntation about t +1 appears on the right hand sideorthe model, it cannot be used for forecasting (see Chapter 16).
4.6.3 Models of impulse transmission
A formal model of impulse transmission has been proposed and tested by King. Casetti, and Jeffrey (1969). If cities form a closed system, then it can be postulated that each city's activity level is governed by only two forces: first, corresponding activity levels in other cities in the system, and second. exogenous 'national' factors, or their delayed consequences, which affect the whole city system. Figure 4.22 attempts to describe such a system
in the simple case shown in Figure 4.21 (Spooner, 1975, p. 35). Note that equation (4.16) is simply a historical reconstruction of the relationships between two series, i.e. national unemployment, the input wave (x), and local unemployment. the output wave (y). Since inforntation about t +1 appears on the right hand sideorthe model, it cannot be used for forecasting (see Chapter 16).
4.6.3 Models of impulse transmission
A formal model of impulse transmission has been proposed and tested by King. Casetti, and Jeffrey (1969). If cities form a closed system, then it can be postulated that each city's activity level is governed by only two forces: first, corresponding activity levels in other cities in the system, and second. exogenous 'national' factors, or their delayed consequences, which affect the whole city system. Figure 4.22 attempts to describe such a system
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