I have seen that post, but when I use this program for estimating, the information for std error-z statistics-prob is NA.
@signal y = c(1) + ar1*y(-1) + ar2*y(-2) + [var=exp(c(2))]
@state ar1 = ar1(-1) + [var=exp(c(3))]
@state ar2 = ar2(-1) + var=exp(c(4))]
the result file attached
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