below is one link for an explanation of the equivalence between AR(1)
and OU so I was wrong about needing an AR(2). at a quick glance, i think
OU's that can always be written as AR(1)'s
( with a correct mapping of parameters ) but not every AR(1) can be
written as an OU ?
http://www.puc-rio.br/marco.ind/revers.html
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