Expressions involving variables - What they calculate

The Coefficient values used in all calculations are pre-simulation values. In particular, these values do not reflect the changes as Coefficients are updated through a multi-step simulation.

Despite this, some expressions do have exact interpretations. For example, if p_X is a percentage change variable and X is a Coefficient representing the associated levels value, the value of the expression

X * p_X

(as would be reported by AnalyseGE) is exactly equal to 100 times the change in X over the simulation (since X is the pre-simulation levels value and p_X is the percentage change in X).

Other calculations done by AnalyseGE may lead to slightly different values if the corresponding expressions were put into the TAB file. An example will make this clear.

Note. The question as to what exactly is being calculated by AnalyseGE (given that the Coefficient values used are pre-simulation ones) is a rather technical issue. We recommend that you do not think too much about until you have used the program a few times. Your natural instincts as to the meaning of what is being calculated will be more than adequate for the purposes of analysing simulation results.

URL of this topic: www.copsmodels.com/webhelp/analysege/hc_expwhat.htm

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