Adding Lag to a System

%% Code "Ind_Analysis_Control.m must be ran first to obtain EEG data

time=(1:length(EEG))/128;
time=time';
i = 1 ;
while i < 15;

    % Incorporate lag in here somehow

    [beta,sigma] = mvregress(EEG,time);

    i=i+1;
end

beta

a = EEG*beta;
plot(time,a)