Homotopy

Hi!

I have Dynare 4.svn20080703

I have a small open eco DSGE model and I am
solely interested in the sensitivity of the steady state
on my ‘nonobservable’ parameters. I thought, that homotopy would
be a useful tool for such an investigation.

I inputed the baseline ss into the initval part, then tried homotopy:

steady(homotopy_mode=3,homotopy_steps=20);

homotopy_setup;

//delta, 0.025,;
//mup, 1.2,;
omega_bar, 0.75,.99;
//theta_w, 3,;
//mup_w, 3/(3-1),;
//sigma, 1.6,;
//vphi, 1.265,;
//h_c, 0.5,;
//h_x, 0.5,;

end;

but it failed with message

??? Reference to non-existent field ‘homotopy_values’.

Error in ==> steady at 37
homotopy3(options_.homotopy_values, options_.homotopy_steps);

Error in ==> ss_henrik at 240
steady;

Error in ==> dynare at 79
evalin(‘base’,fname) ;

Missed sthg in the syntax? Or does the parser fail to fill in a needed
variable?

regards,
Henrik

Hi

I think that the problem comes from the fact that your “steady” statement comes after the “homotopy_setup” block. Try to swap the two.

Best

Sébastien