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Hi Bruno,
LEAP provides the ability to reference any Results variable that you want, which you could use in your autoregression. Have a look through the following:
http://www.energycommunity.org/WebHelpPro/Expressions/Results_Filters.htm
Specifically, to reference a value in the previous year, use the PrevYearValue function, described here:
http://www.energycommunity.org/WebHelpPro/Expressions/PrevYearValue.htm
Good luck,
Taylor