Cannot get residuals of static equations to be zero

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Cannot get residuals of static equations to be zero

Postby jkronick » Fri Feb 14, 2014 5:05 pm

Hi,

When I try and run the attached mod file of a two-country model I get the error message that indicates that it is impossible to find the steady state.
I believe the reason is that the residuals from the static equation do not all equal zero (about half do) but the problem is I cannot figure out why. My initial values are mostly solved analytically while the ones that are not come from economy theory, e.g. consumption greater than investments. I have also reviewed both my model equations and steady state equations used to determine the initial values and I cannot find the error.
I have attached the mod file with the hope that someone can spot the error.

Thanks in advance,
Jeremy
Attachments
JKTwo_Country_Simple_V3.mod
(6.62 KiB) Downloaded 52 times
jkronick
 
Posts: 3
Joined: Fri Feb 14, 2014 4:17 pm

Re: Cannot get residuals of static equations to be zero

Postby jpfeifer » Sat Feb 15, 2014 2:53 pm

The recent unstable provides a trust-region solver (solve_algo=4). Using the attached file is able to find a steady state. This allows running model_diagnostics, which says
model_diagnostic: the Jacobian of the static model is singular
there is 4 colinear relationships between the variables and the equations
Relation 1
Colinear variables:
b_h
b_f
s
c_star
m_star
p_star
l_star
b_hstar
b_fstar
w_star
s_star
Relation 2
Colinear variables:
b_h
b_f
s
c_star
m_star
p_star
l_star
b_hstar
b_fstar
w_star
s_star
Relation 3
Colinear variables:
b_h
b_f
s
c_star
m_star
p_star
l_star
b_hstar
b_fstar
w_star
s_star
Relation 4
Colinear variables:
c
m
p
l
b_h
b_f
w
s
c_star
m_star
p_star
l_star
b_hstar
b_fstar
w_star
Relation 1
Colinear equations
3 4 5 9 16 17 18 22

Relation 2
Colinear equations
3 4 5 9 16 17 18 22

Relation 3
Colinear equations
3 4 5 9 16 17 18 22

Relation 4
Colinear equations
3 4 5 9 16 17 18 22

The presence of a singularity problem typically indicates that there is one
redundant equation entered in the model block, while another non-redundant equation
is missing. The problem often derives from Walras Law.
Attachments
JKTwo_Country_Simple_V3.mod
(6.66 KiB) Downloaded 61 times
------------
Johannes Pfeifer
University of Cologne
https://sites.google.com/site/pfeiferecon/
jpfeifer
 
Posts: 6940
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Location: Cologne, Germany


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