Switching variable state from exogenous to endogenous

[msz111]

Hi,

I am writing a model with the debt dynamics equation. The problem I have is that I need the primary balance (PB) to be exogenous up to where data is available and to be determined within the model thereafter. Unfortunately the model-defined rule does not apply to historical data.

Is there any way to force a model to use actual observations when available and turn the variable endogenous after?

Many thanks for your help

Michele

[EViews Gareth]

The actexist option on the exclude proc:
http://www.eviews.com/help/helpintro.ht ... 23ww215852

[msz111]

Brilliant, thanks!