histval — specifies historical values before the start of a simulation
histval
;
VARIABLE_NAME
(INTEGER
) = EXPRESSION
;
... end
;
EXPRESSION
is any valid expression returning a numerical value and can contain already initialized variable names.
In models with lags on more than one period, the optional histval; ... end; block permits to specify different historical initial values for different periods.
By convention in Dynare, period 1 is the first period of the simulation. Going backward in time, the first period before the start of the simulation is period 0, then period -1, and so on.
If your lagged variables are linked by identities, be careful to satisfy these identities when you set historical initial values.