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Posted: **Fri Jun 05, 2015 12:05 am**

Hi everyone !

I'm new to eviews and i want to incorporate fianancials variables in the estimation of US output gap by using the kalman filter with the multivariate unobserved components models (harvey 1989). I have 2 variables sp500 and credit growth rate . For the sp500 i write this code after decomposed it in cycle and trend and i write this code and it's works.

1980Q1 to 2014Q4

'definition des équations de signal

@signal log(gdp)*100 = sv1 + sv2
@signal log(sp_tr)*100= sv4 +sv5

'décompostion PIB (y)

@state sv1 = c(1) + sv1(-1) + [var = exp(c(2))]
@state sv2 = c(3)*sv2(-1) + c(4)*sv3(-1)+c(5)*sv5(-1)+[var=exp(c(6))]
@state sv3 = sv2(-1)

'decomposition sp500

@state sv4=c(7)+sv4(-1) + [var = exp(c(8))]
@state sv5 =c(9)*sv5(-1)+ c(10)*sv6(-1) + [var = exp(c(11))]
@state sv6 = sv5(-1)

param c(1) 0 c(2) 0.8 c(3) 1.05 c(4) -0.3 c(5) -0.3 c(6) -0.8 c(7) 3.96 c(8) 1 c(9) 1.01 c(10) -0.3 c(11) 3

Now i want to introduce the credit growth rate, how can i rewrite the code because unlike the sp500 it's stationnary and if i m not wrong i don't have to decompose it on trend and cycle?

2) I also want to estimate a second model usig the kalman filter again in order to make a comparison following this paper

https://ideas.repec.org/p/bis/biswps/404.html

The equations are:

y is the output and y* the potential output gap

∆y(t) = ∆y(t-1)+ ε(0,t)
Y(t)- Y*(t) = β( Y(t-1) - Y*(t-1) ) + γ(1) ∆sp(t-k_sp ) + γ(2)∆cred(t-k_cred ) +ε(1,t)

and i am wondering how can i estimate it in sspace did anyone knew the code . Thank you for your help!
best regards!

Posted: **Tue Jun 09, 2015 6:43 am**

Have you searched the forum?

Posted: **Tue Jun 09, 2015 6:47 am**

hello
yes i have
for 1) i think i have a solution but anything for the second one!

Posted: **Tue Jun 09, 2015 7:18 am**

Code: Select all

@signal y = ystar + c(2)*(y(-1)-ystar1) + c(3)*d(sp(?)) + c(4)*d(cr(?)) + [var=1600*exp(c(1))]

@state ystar = ystar(-1) + dystar(-1)
@state dystar = dystar(-1) + [var=exp(c(1))]
@state ystar1 = ystar(-1)

Posted: **Tue Jun 09, 2015 7:59 am**

thank you very much trubador, i am going to try it!

Posted: **Mon Jun 15, 2015 1:22 am**

hi

if i want to introduce a bayesian approach with gamma distributed priors on the parameters and i write this code

Code: Select all

'borio

@signal log(gdp)*100 = gdp_trend + c(2)*(gdp(-1) - gdp_trend1) + c(3)*d(cred(-1)) +  [var=lambda*exp(c(1))]
@state gdp_trend = gdp_trend (-1) + dgdp_trend (-1)
@state dgdp_trend = dgdp_trend (-1) + [var=exp(c(1))]
@state gdp_trend1 =gdp_trend (-1)

@param c(1) -1  c(2)@rgamma (0.70,0.3)  c(2)@rgamma(0.3,0.3)

but it doesn't works i think it's not the appropriate code could you help me please. thank you

Posted: **Mon Jun 15, 2015 2:49 am**

Yes, the syntax is incorrect. Unfortunately, EViews currently does not have any Bayesian treatment of state space models.

Posted: **Mon Jun 15, 2015 3:05 am**

ooh too bad for me
thank you trubador for answering! have you an another software to suggere me ? thank you

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