Anyway, the following could improve the performance of his Matlab code that runs into big loop (not good). From easiest one to more effort demanding:
- Recompile Mex files (his code ran under Matlab 6 that is old 16 bit)
- Using parallel processing toolbox of Matlab
- Replace the Author's method for max log likelihood of optimization function calls with MCMC method.
- Consider more Bayesian approach for parameter estimation.
MRS-GARCH or HMM-GARCH is the older model. Now comes advanced Non-parametric Bayesian model (infinite HMM with GARCH). Here is the link for initial reading http://eprints.pascal-network.org/archive/00005874/
Penny worth beedback. Thanks.


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