One-Way Dimensional Dependence

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When dependence between equations is introduced through any of the following structures, a one-way dimensional dependence occurs:

• A one-way dimensional dependence can occur when you use a LAG or LEAD function and when the argument for the number of time periods is a number. (Otherwise, there may be a two-way dependence, involving both previous and future dimension values, and the compiler assumes that a simultaneous solution is required.) The following example illustrates the use of LAG.

  Opr.Income = Gross.Margin - (Marketing + Selling + R.D)
  Marketing = LAG(Opr.Income, 1, month)
  
  

• A one-way dimensional dependence also can occur when you use a MOVINGAVERAGE, MOVINGMAX, MOVINGMIN, or MOVINGTOTAL function, when that the start and stop arguments are nonzero numbers, and when both the start and top arguments are positive or both are negative. (Otherwise, two-way dimensional dependence is assumed.)

  Opr.Income = Gross.Margin - (Marketing + Selling + R.D)
  Marketing = MOVINGAVERAGE(Opr.Income, -4, -1, 1, month)