Error in Dynare++ official tutorial on timing convention?

Dynare help (legacy posts)
1

Hi there,

I’m reading the official tutorial of Dynare++ by Ondra Kamenik, link dynare.org/documentation-and … torial.pdf

If we take a look at the example on page 3, it’s written

Y = exp(A)*K^alpha*H^(1-alpha);

However, in the official manual of Dynare, the capital stock should be lagged, like

Y = exp(A)*K(-1)^alpha*H^(1-alpha);

I think these two programs are developed under the same logic, how come the timing assumptions are different. Can anybody confirm that the timing in official Dynare++ tutorial is correct? i.e. we should code in Dynare++ like

Y = exp(A)*K^alpha*H^(1-alpha);

Thank you very much!
Best

2

The tutorial is very misleading, because the timing is never mentioned and it uses time to build, which makes it hard to infer the correct timing convention.
The example1.mod from Dynare is in Dynare++

[code]var a, b, c, h, k, y;
varexo e,u;

parameters beta, rho, alpha, delta, theta, psi, tau, phi;

alpha = 0.36;
rho = 0.95;
tau = 0.025;
beta = 0.99;
delta = 0.025;
psi = 0;
theta = 2.95;

phi = 0.1;

model;
cthetah^(1+psi)=(1-alpha)y;
k = beta(((exp(b)c)/(exp(b(+1))c(+1)))(exp(b(+1))alphay(+1)+(1-delta)k));
y = exp(a)(k(-1)^alpha)(h^(1-alpha));
k = exp(b)(y-c)+(1-delta)k(-1);
a = rhoa(-1)+taub(-1) + e;
b = taua(-1)+rhob(-1) + u;
end;

initval;
y = 1;
c = 0.7;
h = 0.1;
k = 11;
a = 0;
b = 0;
e = 0;
u = 0;
end;

vcov = 0.000081 0.000008;0.000008 0.000081];

order = 2;

[/code]
which shows that the same timing convention is used as in Dynare itself.

3

Thank you for clarifying my question.