- Can handle more than one equation.
- Can handle identities.
- Forbids dynamic equations.
- Can handle following LHS y, diff(y), diff(diff(y)), log(y), diff(log(y)) and
diff(diff(log(y))), other transformations will result in an error.
- Added integration tests.
Remark 1. In the integration tests I compare the values returned by the
evaluate routine with the values computed with the simulation
routines. Normally the discrepancies should be small, but this is not
the case when the endogenous variable appear under a log on the
LHS. My current conclusion is that this has more to do with the
cumulation of the accuracy errors in the simulation routine (a
sequence of Newton algorithms) rather than with the evaluate routine.
Remark 2. Currently the only allowed nonlinear transformation on the LHS
endogenous variable is the log. It is not difficult to generalise, at
some point I had all the matlab functions allowed by Dynare,
but this would complicate the code for not much gain.
Added the possibility to associate more than one trend to an endogenous
variable. The number of error correction equations is longer required to be
equal to the number of trends.
Also fixes growth neutrality correction in models with non optimizing
agents (correction was not taking into account the value of the share of non
optimizing agents).
Fixes the iterative_ols estimation of PAC equation when the Rule of Thumbs (non
optimizing) part of the equations contains endogenous and/or exogenous variables.
The routine takes a dseries object as unique argument and return an updated
object with the expectation term.
If the mod file is named `example.mod` and if the (VAR/PAC) expectation model is
named `toto`, then after
var_expectation.print('toto');
the expectation term can be evaluated:
ts = example.var_expectations.evaluate_varexp(ts);
where ts is a dseries object containing all the time series appearign in the
auxiliary (var or trend_component).
See tests/var-expectations/9/example.mod for a self documented example.
Also updated all the integration tests using the option `expression` instead of
`variable` (which is deprecated and will be removed at some point).
Stéphane Adjemian (Charybdis)
Stéphane Adjemian (Charybdis)
Houtan Bastani
Sébastien Villemot