Compute the p-value of Diebold-Mariano Test

Question

Astrik 2017-1-22

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/321450-compute-the-p-value-of-diebold-mariano-test

评论： yl x 2021-11-1

I am using Diebold-Mariano Test for testing the equal predictive accuracy. The use the code written by Semin Ibisevic (2011) to compute it

function DM = dmtest(e1, e2, h)
% Initialization
T = size(e1,1);
% Define the loss differential
d = e1.^2 - e2.^2;
% Ralculate the variance of the loss differential, taking into account
% autocorrelation.
dMean = mean(d);
gamma0 = var(d);
if h > 1
    gamma = zeros(h-1,1);
    for i = 1:h-1
        sampleCov = cov(d(1+i:T),d(1:T-i));
        gamma(i) = sampleCov(2);
    end
    varD = gamma0 + 2*sum(gamma);
else
    varD = gamma0;
end
% Retrieve the diebold mariano statistic DM ~N(0,1)
DM = dMean / sqrt ( (1/T)*varD );

Now, as we see the DM statistic is standard normally distributed.My question is how can I calculate the p-value of this statistic? The null hypothesis is rejected every time the DM is outside the range [-1,96 1,96]