GARCH模型在Matlab中的实现(9页).doc

《GARCH模型在Matlab中的实现(9页).doc》由会员分享，可在线阅读，更多相关《GARCH模型在Matlab中的实现(9页).doc（9页珍藏版）》请在淘文阁 - 分享文档赚钱的网站上搜索。

1、-多元GARCH模型预测的Matlab程序function parameters, loglikelihood, Ht, likelihoods, stdresid, stderrors, A, B, scores = full_bekk_mvgarch(data,p,q, BEKKoptions);% PURPOSE:% To Estimate a full BEKK multivariate GARCH model. % % % USAGE:% parameters, loglikelihood, Ht, likelihoods, stdresid, stderrors, A, B, sc

2、ores = full_bekk_mvgarch(data,p,q,options);% % % INPUTS:% data - A t by k matrix of zero mean residuals% p - The lag length of the innovation process% q - The lag length of the AR process% options - (optional) Options for the optimization(fminunc)% % OUTPUTS:% parameters - A (k*(k+1)/2+p*k2+q*k2 vec

3、tor of estimated parameteters. F% or any k2 set of Innovation or AR parameters X, % reshape(X,k,k) will give the correct matrix% To recover C, use ivech(parmaeters(1:(k*(k+1)/2)% loglikelihood - The loglikelihood of the function at the optimum% Ht - A k x k x t 3 dimension matrix of conditional cova

4、riances% likelihoods - A t by 1 vector of individual likelihoods% stdresid - A t by k matrix of multivariate standardized residuals% stderrors - A numParams2 square matrix of robust Standad Errors(A(-1)*B*A(-1)*t(-1)% A - The estimated inverse of the non-robust Standard errors% B - The estimated cov

5、ariance of teh scores% scores - A t by numParams matrix of individual scores% need to try and get some smart startgin valuesif size(data,2) size(data,1) data=data;endt k=size(data);k2=k*(k+1)/2;scalaropt=optimset(fminunc);scalaropt=optimset(scalaropt,TolFun,1e-1,Display,iter,Diagnostics,on,DiffMaxCh

6、ange,1e-2);startingparameters=scalar_bekk_mvgarch(data,p,q,scalaropt);CChol=startingparameters(1:(k*(k+1)/2);C=ivech(startingparameters(1:(k*(k+1)/2)*ivech(startingparameters(1:(k*(k+1)/2);newA=;newB=;for i=1:p newA=newA diag(ones(k,1)*startingparameters(k*(k+1)/2)+i);endfor i=1:q newB=newB diag(one

7、s(k,1)*startingparameters(k*(k+1)/2)+i+p);endnewA=reshape(newA,k*k*p,1);newB=reshape(newB,k*k*q,1);startingparameters=CChol;newA;newB;if nargin=6 A=hessian_2sided(full_bekk_mvgarch_likelihood,parameters,data,p,q,k,k2,t); h=max(abs(parameters/2),1e-2)*eps(1/3); hplus=parameters+h; hminus=parameters-h

8、; likelihoodsplus=zeros(t,length(parameters); likelihoodsminus=zeros(t,length(parameters); for i=1:length(parameters) hparameters=parameters; hparameters(i)=hplus(i); HOLDER, indivlike = full_bekk_mvgarch_likelihood(hparameters,data,p,q,k,k2,t); likelihoodsplus(:,i)=indivlike; end for i=1:length(parameters) hparameters=parameters; hparameters(i)=hminus(i); HOLDER, indivlike = full_bekk_mvgarch_likelihood(hparameters,data,p,q,k,k2,t); likelihoodsminus(:,i)=indivlike; end scores=(likelihoodsplus-likelihoodsminus)./(2*repmat(h,t,1); B=cov(scores); A=A/t; stderrors=A(-1)*B*A(-1)*t(-1);end第 9 页-