输入这些命令以后：% Hausman test FE versus RE of model + spatially lagged dependent variable
Hausman=(blagfe-blagre)'*inv(covblagre-covb1agfe)*(blagfe-blagre);
dof=length(blagfe);
probability=1-chis_prb(abs(hausman),dof);
% Note:probability>0.05 implies rejection of random effects model in favor of
fixed effects model
fprintf(1,'hausman test—statistic,degrees of freedom and probability=
%9.4f,%6d,%9.4f\n',hausman,dof,probability);

MATLAB提示??? Undefined function or variable 'blagfe'.，请问这是怎么回事啊