create u 1000

smpl @all


matrix(500,1) ma1
matrix(500,1) ma1se

for !k= 1 to 500
genr u=nrnd
genr y=nrnd
smpl 2 1000
genr y=0.01*y(-1)+nrnd
smpl @all  
equation eq1
eq1.ls  y ar(1) ma(1)
ma1(!k,1)= eq1.@coefs(2)
ma1se(!k,1) =eq1.@coefcov(2,2)^0.5
next