verify_volatility.PosteriorBSVAR function

Verifies heteroskedasticity of structural shocks equation by equation

This function will be deprecated starting from version 4.0. It is replaced by verify_identification function.

Displays information that the model is homoskedastic.

## S3 method for class 'PosteriorBSVAR'
verify_volatility(posterior)

Arguments

• posterior: the posterior element of the list from the estimation outcome

Returns

Nothing. Just displays a message: The model is homoskedastic.

Examples

# simple workflow
############################################################
# upload data
data(us_fiscal_lsuw)

# specify the model and set seed
specification  = specify_bsvar$new(us_fiscal_lsuw, p = 1)
set.seed(123)

# estimate the model
posterior      = estimate(specification, 10)

# verify heteroskedasticity
sddr           = verify_volatility(posterior)

# workflow with the pipe |>
############################################################
set.seed(123)
us_fiscal_lsuw |>
  specify_bsvar$new(p = 1) |>
  estimate(S = 10) |> 
  verify_volatility() -> sddr

References

Lütkepohl, H., and Woźniak, T., (2020) Bayesian Inference for Structural Vector Autoregressions Identified by Markov-Switching Heteroskedasticity. Journal of Economic Dynamics and Control 113 , 103862, tools:::Rd_expr_doi("10.1016/j.jedc.2020.103862") .

Lütkepohl, H., Shang, F., Uzeda, L., and Woźniak, T. (2024) Partial Identification of Heteroskedastic Structural VARs: Theory and Bayesian Inference. University of Melbourne Working Paper, 1--57, tools:::Rd_expr_doi("10.48550/arXiv.2404.11057") .

Author(s)

Tomasz Woźniak wozniak.tom@pm.me