Risposto
var2vec standard errors
Hi Folmer, When we convert a VAR to VEC, using VEC = var2vec(VAR), we assume that the VAR coefficients are known, so that the...

circa 9 anni fa | 0

Risposto
How to impose restrictions on a parameter matrix
Hi Imner, Eigenvalue restrictions are nonlinear constraints imposed on the least square estimators. To estimate parameters, w...

oltre 9 anni fa | 0

Risposto
what does 'bounds' signify in the autocorr function
Hi aboltabol, If we put autocorr(y), it will assume the true process is a white noise, under which the autocorrelations rho(...

oltre 9 anni fa | 0

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Risposto
How to get the expected Hessian variance-covariance matrix from vgxvarx?
Hi Lisa, The parameter covariance matrix is not an output variable of VGXVARX, while the standard errors are returned as the ...

oltre 9 anni fa | 0

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Risposto
Is it possible to adapt a vector autoregressive model’s parameters continuously without the need to rerun vgxvarx?
Hi Peta, The VGXVARX function cannot adapt model parameters, but the idea you proposed can be implemented. VAR models are typ...

oltre 9 anni fa | 0

Risposto
GARCH Error: Econometrics Toolbox
You might consider adding a mean equation, say an AR(p) process, to your model, as I saw the “Offset” term is Inf and the “Const...

oltre 9 anni fa | 0

Risposto
problem with estimate ARIMA
Hi Jan, The error means that there are eigenvalues outside the unit circle. Since an explosive economic time series is unlike...

oltre 9 anni fa | 0

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Risposto
Problem with vector autoregressive model (vgxvarx) - "Covariance is not positive-definite."
Hi Peta, The codes appear syntactically correct. You might want to check the correlations of your 27 variables and the consta...

oltre 9 anni fa | 0

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Risposto
Including exogenous (predictor) variables in the state equation of a state space model
I think there are couple of ways to put an exogenous term in the state equation. First, we may add a constant one as the sta...

quasi 10 anni fa | 1

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Risposto
New vs Old Econometrics Toolbox: garchset/garchfit vs gatch/estimate/infer for getting conditional standard deviations
I think there are two main causes of the result discrepancy. First, the GARCHFIT estimates an offset term (the intercept term...

quasi 10 anni fa | 1

Risposto
ARMA simulation and estimation
The ESTIAMTE method of ARIMA does not accept multiple paths of data. Instead, we may estimate the model path by path using a FOR...

quasi 10 anni fa | 1

Risposto
Hi, I want the EGARCH code with mean and variance equation specification for the estimation of idiosyncratic volatility.
I would suggest ARIMA functionality for the mean equation and a name-value pair “Variance” for a conditional variance model obje...

oltre 10 anni fa | 0

Risposto
How to compute confidence bands for IRF's within in vgx framework?
Hi Esben, I am not aware of an easy way to compute the confidence intervals of the impulse-responses using vgx functionalitie...

oltre 10 anni fa | 0

Risposto
Wind speed prediction using ARIMA model
To forecast an ARIMA model, we want to provide both a fitted model as well as data. The former only carries model coefficients, ...

oltre 10 anni fa | 3

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Risposto
Inquiry on Johansen method (jcitest function)
I think the number of cointegrations inferred from the data is suggestive rather than conclusive. If we have some theory that ba...

quasi 11 anni fa | 0

Risposto
Estimate state-space model parameters using Parameter Mapping function
If we included the beta*S*I term, the state transition would be non-linear with respect to past states B, S, I, P, and D. In tha...

quasi 11 anni fa | 0

Risposto
How to get GARCH parameters into a vector
To save the GARCH estimator as a vector, add a line to the above codes: estParams = [cell2mat(fit.GARCH), cell2mat(fit.ARCH)]...

quasi 11 anni fa | 0

Risposto
How can I estimate a Vector Autoregressive (VAR) Model by OLS?
Yes, estimation of a VAR(p) model by OLS is possible using the vgxvarx functionality. The vgxvarx uses maximum likelihood for r...

quasi 11 anni fa | 2

Risposto
Why would vgxsim and vgxpred yield different forecasts?
I think vgxsim and vgxpred will produce the same forecasts as long as the presample values are specified. For a VAR(p) model, vg...

quasi 11 anni fa | 0

Risposto
Error With Forecasting ARIMAX Model
To forecast the ARIMA model, we want a model with all coefficients being known. After parameter estimation, the fitted model is ...

quasi 11 anni fa | 0

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